Use mattermost v5 module (#1192)

12 files changed, 1811 insertions, 0 deletions

diff --git a/vendor/github.com/mattermost/go-i18n/LICENSE b/vendor/github.com/mattermost/go-i18n/LICENSE
new file mode 100644
index 00000000..609cce79
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2014 Nick Snyder https://github.com/nicksnyder
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/bundle/bundle.go b/vendor/github.com/mattermost/go-i18n/i18n/bundle/bundle.go
new file mode 100644
index 00000000..c80512d7
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/bundle/bundle.go
@@ -0,0 +1,452 @@
+// Package bundle manages translations for multiple languages.
+package bundle
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"reflect"
+	"sync"
+	"unicode"
+
+	"github.com/mattermost/go-i18n/i18n/language"
+	"github.com/mattermost/go-i18n/i18n/translation"
+	toml "github.com/pelletier/go-toml"
+	"gopkg.in/yaml.v2"
+)
+
+// TranslateFunc is a copy of i18n.TranslateFunc to avoid a circular dependency.
+type TranslateFunc func(translationID string, args ...interface{}) string
+
+// Bundle stores the translations for multiple languages.
+type Bundle struct {
+	// The primary translations for a language tag and translation id.
+	translations map[string]map[string]translation.Translation
+
+	// Translations that can be used when an exact language match is not possible.
+	fallbackTranslations map[string]map[string]translation.Translation
+
+	sync.RWMutex
+}
+
+// New returns an empty bundle.
+func New() *Bundle {
+	return &Bundle{
+		translations:         make(map[string]map[string]translation.Translation),
+		fallbackTranslations: make(map[string]map[string]translation.Translation),
+	}
+}
+
+// MustLoadTranslationFile is similar to LoadTranslationFile
+// except it panics if an error happens.
+func (b *Bundle) MustLoadTranslationFile(filename string) {
+	if err := b.LoadTranslationFile(filename); err != nil {
+		panic(err)
+	}
+}
+
+// LoadTranslationFile loads the translations from filename into memory.
+//
+// The language that the translations are associated with is parsed from the filename (e.g. en-US.json).
+//
+// Generally you should load translation files once during your program's initialization.
+func (b *Bundle) LoadTranslationFile(filename string) error {
+	buf, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+	return b.ParseTranslationFileBytes(filename, buf)
+}
+
+// ParseTranslationFileBytes is similar to LoadTranslationFile except it parses the bytes in buf.
+//
+// It is useful for parsing translation files embedded with go-bindata.
+func (b *Bundle) ParseTranslationFileBytes(filename string, buf []byte) error {
+	basename := filepath.Base(filename)
+	langs := language.Parse(basename)
+	switch l := len(langs); {
+	case l == 0:
+		return fmt.Errorf("no language found in %q", basename)
+	case l > 1:
+		return fmt.Errorf("multiple languages found in filename %q: %v; expected one", basename, langs)
+	}
+	translations, err := parseTranslations(filename, buf)
+	if err != nil {
+		return err
+	}
+	b.AddTranslation(langs[0], translations...)
+	return nil
+}
+
+func parseTranslations(filename string, buf []byte) ([]translation.Translation, error) {
+	if len(buf) == 0 {
+		return []translation.Translation{}, nil
+	}
+
+	ext := filepath.Ext(filename)
+
+	// `github.com/pelletier/go-toml` lacks an Unmarshal function,
+	// so we should parse TOML separately.
+	if ext == ".toml" {
+		tree, err := toml.LoadReader(bytes.NewReader(buf))
+		if err != nil {
+			return nil, err
+		}
+
+		m := make(map[string]map[string]interface{})
+		for k, v := range tree.ToMap() {
+			m[k] = v.(map[string]interface{})
+		}
+
+		return parseFlatFormat(m)
+	}
+
+	// Then parse other formats.
+	if isStandardFormat(ext, buf) {
+		var standardFormat []map[string]interface{}
+		if err := unmarshal(ext, buf, &standardFormat); err != nil {
+			return nil, fmt.Errorf("failed to unmarshal %v: %v", filename, err)
+		}
+		return parseStandardFormat(standardFormat)
+	}
+	var flatFormat map[string]map[string]interface{}
+	if err := unmarshal(ext, buf, &flatFormat); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal %v: %v", filename, err)
+	}
+	return parseFlatFormat(flatFormat)
+}
+
+func isStandardFormat(ext string, buf []byte) bool {
+	buf = deleteLeadingComments(ext, buf)
+	firstRune := rune(buf[0])
+	return (ext == ".json" && firstRune == '[') || (ext == ".yaml" && firstRune == '-')
+}
+
+// deleteLeadingComments deletes leading newlines and comments in buf.
+// It only works for ext == ".yaml".
+func deleteLeadingComments(ext string, buf []byte) []byte {
+	if ext != ".yaml" {
+		return buf
+	}
+
+	for {
+		buf = bytes.TrimLeftFunc(buf, unicode.IsSpace)
+		if buf[0] == '#' {
+			buf = deleteLine(buf)
+		} else {
+			break
+		}
+	}
+
+	return buf
+}
+
+func deleteLine(buf []byte) []byte {
+	index := bytes.IndexRune(buf, '\n')
+	if index == -1 { // If there is only one line without newline ...
+		return nil // ... delete it and return nothing.
+	}
+	if index == len(buf)-1 { // If there is only one line with newline ...
+		return nil // ... do the same as above.
+	}
+	return buf[index+1:]
+}
+
+// unmarshal finds an appropriate unmarshal function for ext
+// (extension of filename) and unmarshals buf to out. out must be a pointer.
+func unmarshal(ext string, buf []byte, out interface{}) error {
+	switch ext {
+	case ".json":
+		return json.Unmarshal(buf, out)
+	case ".yaml":
+		return yaml.Unmarshal(buf, out)
+	}
+
+	return fmt.Errorf("unsupported file extension %v", ext)
+}
+
+func parseStandardFormat(data []map[string]interface{}) ([]translation.Translation, error) {
+	translations := make([]translation.Translation, 0, len(data))
+	for i, translationData := range data {
+		t, err := translation.NewTranslation(translationData)
+		if err != nil {
+			return nil, fmt.Errorf("unable to parse translation #%d because %s\n%v", i, err, translationData)
+		}
+		translations = append(translations, t)
+	}
+	return translations, nil
+}
+
+// parseFlatFormat just converts data from flat format to standard format
+// and passes it to parseStandardFormat.
+//
+// Flat format logic:
+// key of data must be a string and data[key] must be always map[string]interface{},
+// but if there is only "other" key in it then it is non-plural, else plural.
+func parseFlatFormat(data map[string]map[string]interface{}) ([]translation.Translation, error) {
+	var standardFormatData []map[string]interface{}
+	for id, translationData := range data {
+		dataObject := make(map[string]interface{})
+		dataObject["id"] = id
+		if len(translationData) == 1 { // non-plural form
+			_, otherExists := translationData["other"]
+			if otherExists {
+				dataObject["translation"] = translationData["other"]
+			}
+		} else { // plural form
+			dataObject["translation"] = translationData
+		}
+
+		standardFormatData = append(standardFormatData, dataObject)
+	}
+
+	return parseStandardFormat(standardFormatData)
+}
+
+// AddTranslation adds translations for a language.
+//
+// It is useful if your translations are in a format not supported by LoadTranslationFile.
+func (b *Bundle) AddTranslation(lang *language.Language, translations ...translation.Translation) {
+	b.Lock()
+	defer b.Unlock()
+	if b.translations[lang.Tag] == nil {
+		b.translations[lang.Tag] = make(map[string]translation.Translation, len(translations))
+	}
+	currentTranslations := b.translations[lang.Tag]
+	for _, newTranslation := range translations {
+		if currentTranslation := currentTranslations[newTranslation.ID()]; currentTranslation != nil {
+			currentTranslations[newTranslation.ID()] = currentTranslation.Merge(newTranslation)
+		} else {
+			currentTranslations[newTranslation.ID()] = newTranslation
+		}
+	}
+
+	// lang can provide translations for less specific language tags.
+	for _, tag := range lang.MatchingTags() {
+		b.fallbackTranslations[tag] = currentTranslations
+	}
+}
+
+// Translations returns all translations in the bundle.
+func (b *Bundle) Translations() map[string]map[string]translation.Translation {
+	t := make(map[string]map[string]translation.Translation)
+	b.RLock()
+	for tag, translations := range b.translations {
+		t[tag] = make(map[string]translation.Translation)
+		for id, translation := range translations {
+			t[tag][id] = translation
+		}
+	}
+	b.RUnlock()
+	return t
+}
+
+// LanguageTags returns the tags of all languages that that have been added.
+func (b *Bundle) LanguageTags() []string {
+	var tags []string
+	b.RLock()
+	for k := range b.translations {
+		tags = append(tags, k)
+	}
+	b.RUnlock()
+	return tags
+}
+
+// LanguageTranslationIDs returns the ids of all translations that have been added for a given language.
+func (b *Bundle) LanguageTranslationIDs(languageTag string) []string {
+	var ids []string
+	b.RLock()
+	for id := range b.translations[languageTag] {
+		ids = append(ids, id)
+	}
+	b.RUnlock()
+	return ids
+}
+
+// MustTfunc is similar to Tfunc except it panics if an error happens.
+func (b *Bundle) MustTfunc(pref string, prefs ...string) TranslateFunc {
+	tfunc, err := b.Tfunc(pref, prefs...)
+	if err != nil {
+		panic(err)
+	}
+	return tfunc
+}
+
+// MustTfuncAndLanguage is similar to TfuncAndLanguage except it panics if an error happens.
+func (b *Bundle) MustTfuncAndLanguage(pref string, prefs ...string) (TranslateFunc, *language.Language) {
+	tfunc, language, err := b.TfuncAndLanguage(pref, prefs...)
+	if err != nil {
+		panic(err)
+	}
+	return tfunc, language
+}
+
+// Tfunc is similar to TfuncAndLanguage except is doesn't return the Language.
+func (b *Bundle) Tfunc(pref string, prefs ...string) (TranslateFunc, error) {
+	tfunc, _, err := b.TfuncAndLanguage(pref, prefs...)
+	return tfunc, err
+}
+
+// TfuncAndLanguage returns a TranslateFunc for the first Language that
+// has a non-zero number of translations in the bundle.
+//
+// The returned Language matches the the first language preference that could be satisfied,
+// but this may not strictly match the language of the translations used to satisfy that preference.
+//
+// For example, the user may request "zh". If there are no translations for "zh" but there are translations
+// for "zh-cn", then the translations for "zh-cn" will be used but the returned Language will be "zh".
+//
+// It can parse languages from Accept-Language headers (RFC 2616),
+// but it assumes weights are monotonically decreasing.
+func (b *Bundle) TfuncAndLanguage(pref string, prefs ...string) (TranslateFunc, *language.Language, error) {
+	lang := b.supportedLanguage(pref, prefs...)
+	var err error
+	if lang == nil {
+		err = fmt.Errorf("no supported languages found %#v", append(prefs, pref))
+	}
+	return func(translationID string, args ...interface{}) string {
+		return b.translate(lang, translationID, args...)
+	}, lang, err
+}
+
+// supportedLanguage returns the first language which
+// has a non-zero number of translations in the bundle.
+func (b *Bundle) supportedLanguage(pref string, prefs ...string) *language.Language {
+	lang := b.translatedLanguage(pref)
+	if lang == nil {
+		for _, pref := range prefs {
+			lang = b.translatedLanguage(pref)
+			if lang != nil {
+				break
+			}
+		}
+	}
+	return lang
+}
+
+func (b *Bundle) translatedLanguage(src string) *language.Language {
+	langs := language.Parse(src)
+	b.RLock()
+	defer b.RUnlock()
+	for _, lang := range langs {
+		if len(b.translations[lang.Tag]) > 0 ||
+			len(b.fallbackTranslations[lang.Tag]) > 0 {
+			return lang
+		}
+	}
+	return nil
+}
+
+func (b *Bundle) translate(lang *language.Language, translationID string, args ...interface{}) string {
+	if lang == nil {
+		return translationID
+	}
+
+	translation := b.translation(lang, translationID)
+	if translation == nil {
+		return translationID
+	}
+
+	var data interface{}
+	var count interface{}
+	if argc := len(args); argc > 0 {
+		if isNumber(args[0]) {
+			count = args[0]
+			if argc > 1 {
+				data = args[1]
+			}
+		} else {
+			data = args[0]
+		}
+	}
+
+	if count != nil {
+		if data == nil {
+			data = map[string]interface{}{"Count": count}
+		} else {
+			dataMap := toMap(data)
+			dataMap["Count"] = count
+			data = dataMap
+		}
+	} else {
+		dataMap := toMap(data)
+		if c, ok := dataMap["Count"]; ok {
+			count = c
+		}
+	}
+
+	p, _ := lang.Plural(count)
+	template := translation.Template(p)
+	if template == nil {
+		if p == language.Other {
+			return translationID
+		}
+		countInt, ok := count.(int)
+		if ok && countInt > 1 {
+			template = translation.Template(language.Other)
+			if template == nil {
+				return translationID
+			}
+		}
+	}
+
+	s := template.Execute(data)
+	if s == "" {
+		return translationID
+	}
+	return s
+}
+
+func (b *Bundle) translation(lang *language.Language, translationID string) translation.Translation {
+	b.RLock()
+	defer b.RUnlock()
+	translations := b.translations[lang.Tag]
+	if translations == nil {
+		translations = b.fallbackTranslations[lang.Tag]
+		if translations == nil {
+			return nil
+		}
+	}
+	return translations[translationID]
+}
+
+func isNumber(n interface{}) bool {
+	switch n.(type) {
+	case int, int8, int16, int32, int64, string:
+		return true
+	}
+	return false
+}
+
+func toMap(input interface{}) map[string]interface{} {
+	if data, ok := input.(map[string]interface{}); ok {
+		return data
+	}
+	v := reflect.ValueOf(input)
+	switch v.Kind() {
+	case reflect.Ptr:
+		return toMap(v.Elem().Interface())
+	case reflect.Struct:
+		return structToMap(v)
+	default:
+		return nil
+	}
+}
+
+// Converts the top level of a struct to a map[string]interface{}.
+// Code inspired by github.com/fatih/structs.
+func structToMap(v reflect.Value) map[string]interface{} {
+	out := make(map[string]interface{})
+	t := v.Type()
+	for i := 0; i < t.NumField(); i++ {
+		field := t.Field(i)
+		if field.PkgPath != "" {
+			// unexported field. skip.
+			continue
+		}
+		out[field.Name] = v.FieldByName(field.Name).Interface()
+	}
+	return out
+}
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/i18n.go b/vendor/github.com/mattermost/go-i18n/i18n/i18n.go
new file mode 100644
index 00000000..4c95b996
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/i18n.go
@@ -0,0 +1,158 @@
+// Package i18n supports string translations with variable substitution and CLDR pluralization.
+// It is intended to be used in conjunction with the goi18n command, although that is not strictly required.
+//
+// Initialization
+//
+// Your Go program should load translations during its initialization.
+//     i18n.MustLoadTranslationFile("path/to/fr-FR.all.json")
+// If your translations are in a file format not supported by (Must)?LoadTranslationFile,
+// then you can use the AddTranslation function to manually add translations.
+//
+// Fetching a translation
+//
+// Use Tfunc or MustTfunc to fetch a TranslateFunc that will return the translated string for a specific language.
+//     func handleRequest(w http.ResponseWriter, r *http.Request) {
+//         cookieLang := r.Cookie("lang")
+//         acceptLang := r.Header.Get("Accept-Language")
+//         defaultLang = "en-US"  // known valid language
+//         T, err := i18n.Tfunc(cookieLang, acceptLang, defaultLang)
+//         fmt.Println(T("Hello world"))
+//     }
+//
+// Usually it is a good idea to identify strings by a generic id rather than the English translation,
+// but the rest of this documentation will continue to use the English translation for readability.
+//     T("Hello world")     // ok
+//     T("programGreeting") // better!
+//
+// Variables
+//
+// TranslateFunc supports strings that have variables using the text/template syntax.
+//     T("Hello {{.Person}}", map[string]interface{}{
+//         "Person": "Bob",
+//     })
+//
+// Pluralization
+//
+// TranslateFunc supports the pluralization of strings using the CLDR pluralization rules defined here:
+// http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html
+//     T("You have {{.Count}} unread emails.", 2)
+//     T("I am {{.Count}} meters tall.", "1.7")
+//
+// Plural strings may also have variables.
+//     T("{{.Person}} has {{.Count}} unread emails", 2, map[string]interface{}{
+//         "Person": "Bob",
+//     })
+//
+// Sentences with multiple plural components can be supported with nesting.
+//     T("{{.Person}} has {{.Count}} unread emails in the past {{.Timeframe}}.", 3, map[string]interface{}{
+//         "Person":    "Bob",
+//         "Timeframe": T("{{.Count}} days", 2),
+//     })
+//
+// Templates
+//
+// You can use the .Funcs() method of a text/template or html/template to register a TranslateFunc
+// for usage inside of that template.
+package i18n
+
+import (
+	"github.com/mattermost/go-i18n/i18n/bundle"
+	"github.com/mattermost/go-i18n/i18n/language"
+	"github.com/mattermost/go-i18n/i18n/translation"
+)
+
+// TranslateFunc returns the translation of the string identified by translationID.
+//
+// If there is no translation for translationID, then the translationID itself is returned.
+// This makes it easy to identify missing translations in your app.
+//
+// If translationID is a non-plural form, then the first variadic argument may be a map[string]interface{}
+// or struct that contains template data.
+//
+// If translationID is a plural form, the function accepts two parameter signatures
+// 1. T(count int, data struct{})
+// The first variadic argument must be an integer type
+// (int, int8, int16, int32, int64) or a float formatted as a string (e.g. "123.45").
+// The second variadic argument may be a map[string]interface{} or struct{} that contains template data.
+// 2. T(data struct{})
+// data must be a struct{} or map[string]interface{} that contains a Count field and the template data,
+// Count field must be an integer type (int, int8, int16, int32, int64)
+// or a float formatted as a string (e.g. "123.45").
+type TranslateFunc func(translationID string, args ...interface{}) string
+
+// IdentityTfunc returns a TranslateFunc that always returns the translationID passed to it.
+//
+// It is a useful placeholder when parsing a text/template or html/template
+// before the actual Tfunc is available.
+func IdentityTfunc() TranslateFunc {
+	return func(translationID string, args ...interface{}) string {
+		return translationID
+	}
+}
+
+var defaultBundle = bundle.New()
+
+// MustLoadTranslationFile is similar to LoadTranslationFile
+// except it panics if an error happens.
+func MustLoadTranslationFile(filename string) {
+	defaultBundle.MustLoadTranslationFile(filename)
+}
+
+// LoadTranslationFile loads the translations from filename into memory.
+//
+// The language that the translations are associated with is parsed from the filename (e.g. en-US.json).
+//
+// Generally you should load translation files once during your program's initialization.
+func LoadTranslationFile(filename string) error {
+	return defaultBundle.LoadTranslationFile(filename)
+}
+
+// ParseTranslationFileBytes is similar to LoadTranslationFile except it parses the bytes in buf.
+//
+// It is useful for parsing translation files embedded with go-bindata.
+func ParseTranslationFileBytes(filename string, buf []byte) error {
+	return defaultBundle.ParseTranslationFileBytes(filename, buf)
+}
+
+// AddTranslation adds translations for a language.
+//
+// It is useful if your translations are in a format not supported by LoadTranslationFile.
+func AddTranslation(lang *language.Language, translations ...translation.Translation) {
+	defaultBundle.AddTranslation(lang, translations...)
+}
+
+// LanguageTags returns the tags of all languages that have been added.
+func LanguageTags() []string {
+	return defaultBundle.LanguageTags()
+}
+
+// LanguageTranslationIDs returns the ids of all translations that have been added for a given language.
+func LanguageTranslationIDs(languageTag string) []string {
+	return defaultBundle.LanguageTranslationIDs(languageTag)
+}
+
+// MustTfunc is similar to Tfunc except it panics if an error happens.
+func MustTfunc(languageSource string, languageSources ...string) TranslateFunc {
+	return TranslateFunc(defaultBundle.MustTfunc(languageSource, languageSources...))
+}
+
+// Tfunc returns a TranslateFunc that will be bound to the first language which
+// has a non-zero number of translations.
+//
+// It can parse languages from Accept-Language headers (RFC 2616).
+func Tfunc(languageSource string, languageSources ...string) (TranslateFunc, error) {
+	tfunc, err := defaultBundle.Tfunc(languageSource, languageSources...)
+	return TranslateFunc(tfunc), err
+}
+
+// MustTfuncAndLanguage is similar to TfuncAndLanguage except it panics if an error happens.
+func MustTfuncAndLanguage(languageSource string, languageSources ...string) (TranslateFunc, *language.Language) {
+	tfunc, lang := defaultBundle.MustTfuncAndLanguage(languageSource, languageSources...)
+	return TranslateFunc(tfunc), lang
+}
+
+// TfuncAndLanguage is similar to Tfunc except it also returns the language which TranslateFunc is bound to.
+func TfuncAndLanguage(languageSource string, languageSources ...string) (TranslateFunc, *language.Language, error) {
+	tfunc, lang, err := defaultBundle.TfuncAndLanguage(languageSource, languageSources...)
+	return TranslateFunc(tfunc), lang, err
+}
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/language/language.go b/vendor/github.com/mattermost/go-i18n/i18n/language/language.go
new file mode 100644
index 00000000..b045a275
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/language/language.go
@@ -0,0 +1,99 @@
+// Package language defines languages that implement CLDR pluralization.
+package language
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Language is a written human language.
+type Language struct {
+	// Tag uniquely identifies the language as defined by RFC 5646.
+	//
+	// Most language tags are a two character language code (ISO 639-1)
+	// optionally followed by a dash and a two character country code (ISO 3166-1).
+	// (e.g. en, pt-br)
+	Tag string
+	*PluralSpec
+}
+
+func (l *Language) String() string {
+	return l.Tag
+}
+
+// MatchingTags returns the set of language tags that map to this Language.
+// e.g. "zh-hans-cn" yields {"zh", "zh-hans", "zh-hans-cn"}
+// BUG: This should be computed once and stored as a field on Language for efficiency,
+//      but this would require changing how Languages are constructed.
+func (l *Language) MatchingTags() []string {
+	parts := strings.Split(l.Tag, "-")
+	var prefix, matches []string
+	for _, part := range parts {
+		prefix = append(prefix, part)
+		match := strings.Join(prefix, "-")
+		matches = append(matches, match)
+	}
+	return matches
+}
+
+// Parse returns a slice of supported languages found in src or nil if none are found.
+// It can parse language tags and Accept-Language headers.
+func Parse(src string) []*Language {
+	var langs []*Language
+	start := 0
+	for end, chr := range src {
+		switch chr {
+		case ',', ';', '.':
+			tag := strings.TrimSpace(src[start:end])
+			if spec := GetPluralSpec(tag); spec != nil {
+				langs = append(langs, &Language{NormalizeTag(tag), spec})
+			}
+			start = end + 1
+		}
+	}
+	if start > 0 {
+		tag := strings.TrimSpace(src[start:])
+		if spec := GetPluralSpec(tag); spec != nil {
+			langs = append(langs, &Language{NormalizeTag(tag), spec})
+		}
+		return dedupe(langs)
+	}
+	if spec := GetPluralSpec(src); spec != nil {
+		langs = append(langs, &Language{NormalizeTag(src), spec})
+	}
+	return langs
+}
+
+func dedupe(langs []*Language) []*Language {
+	found := make(map[string]struct{}, len(langs))
+	deduped := make([]*Language, 0, len(langs))
+	for _, lang := range langs {
+		if _, ok := found[lang.Tag]; !ok {
+			found[lang.Tag] = struct{}{}
+			deduped = append(deduped, lang)
+		}
+	}
+	return deduped
+}
+
+// MustParse is similar to Parse except it panics instead of retuning a nil Language.
+func MustParse(src string) []*Language {
+	langs := Parse(src)
+	if len(langs) == 0 {
+		panic(fmt.Errorf("unable to parse language from %q", src))
+	}
+	return langs
+}
+
+// Add adds support for a new language.
+func Add(l *Language) {
+	tag := NormalizeTag(l.Tag)
+	pluralSpecs[tag] = l.PluralSpec
+}
+
+// NormalizeTag returns a language tag with all lower-case characters
+// and dashes "-" instead of underscores "_"
+func NormalizeTag(tag string) string {
+	tag = strings.ToLower(tag)
+	return strings.Replace(tag, "_", "-", -1)
+}
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/language/operands.go b/vendor/github.com/mattermost/go-i18n/i18n/language/operands.go
new file mode 100644
index 00000000..c0bee68d
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/language/operands.go
@@ -0,0 +1,119 @@
+package language
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// Operands is a representation of http://unicode.org/reports/tr35/tr35-numbers.html#Operands
+type Operands struct {
+	N float64 // absolute value of the source number (integer and decimals)
+	I int64   // integer digits of n
+	V int64   // number of visible fraction digits in n, with trailing zeros
+	W int64   // number of visible fraction digits in n, without trailing zeros
+	F int64   // visible fractional digits in n, with trailing zeros
+	T int64   // visible fractional digits in n, without trailing zeros
+}
+
+// NequalsAny returns true if o represents an integer equal to any of the arguments.
+func (o *Operands) NequalsAny(any ...int64) bool {
+	for _, i := range any {
+		if o.I == i && o.T == 0 {
+			return true
+		}
+	}
+	return false
+}
+
+// NmodEqualsAny returns true if o represents an integer equal to any of the arguments modulo mod.
+func (o *Operands) NmodEqualsAny(mod int64, any ...int64) bool {
+	modI := o.I % mod
+	for _, i := range any {
+		if modI == i && o.T == 0 {
+			return true
+		}
+	}
+	return false
+}
+
+// NinRange returns true if o represents an integer in the closed interval [from, to].
+func (o *Operands) NinRange(from, to int64) bool {
+	return o.T == 0 && from <= o.I && o.I <= to
+}
+
+// NmodInRange returns true if o represents an integer in the closed interval [from, to] modulo mod.
+func (o *Operands) NmodInRange(mod, from, to int64) bool {
+	modI := o.I % mod
+	return o.T == 0 && from <= modI && modI <= to
+}
+
+func newOperands(v interface{}) (*Operands, error) {
+	switch v := v.(type) {
+	case int:
+		return newOperandsInt64(int64(v)), nil
+	case int8:
+		return newOperandsInt64(int64(v)), nil
+	case int16:
+		return newOperandsInt64(int64(v)), nil
+	case int32:
+		return newOperandsInt64(int64(v)), nil
+	case int64:
+		return newOperandsInt64(v), nil
+	case string:
+		return newOperandsString(v)
+	case float32, float64:
+		return nil, fmt.Errorf("floats should be formatted into a string")
+	default:
+		return nil, fmt.Errorf("invalid type %T; expected integer or string", v)
+	}
+}
+
+func newOperandsInt64(i int64) *Operands {
+	if i < 0 {
+		i = -i
+	}
+	return &Operands{float64(i), i, 0, 0, 0, 0}
+}
+
+func newOperandsString(s string) (*Operands, error) {
+	if s[0] == '-' {
+		s = s[1:]
+	}
+	n, err := strconv.ParseFloat(s, 64)
+	if err != nil {
+		return nil, err
+	}
+	ops := &Operands{N: n}
+	parts := strings.SplitN(s, ".", 2)
+	ops.I, err = strconv.ParseInt(parts[0], 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	if len(parts) == 1 {
+		return ops, nil
+	}
+	fraction := parts[1]
+	ops.V = int64(len(fraction))
+	for i := ops.V - 1; i >= 0; i-- {
+		if fraction[i] != '0' {
+			ops.W = i + 1
+			break
+		}
+	}
+	if ops.V > 0 {
+		f, err := strconv.ParseInt(fraction, 10, 0)
+		if err != nil {
+			return nil, err
+		}
+		ops.F = f
+	}
+	if ops.W > 0 {
+		t, err := strconv.ParseInt(fraction[:ops.W], 10, 0)
+		if err != nil {
+			return nil, err
+		}
+		ops.T = t
+	}
+	return ops, nil
+}
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/language/plural.go b/vendor/github.com/mattermost/go-i18n/i18n/language/plural.go
new file mode 100644
index 00000000..1f3ea5c6
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/language/plural.go
@@ -0,0 +1,40 @@
+package language
+
+import (
+	"fmt"
+)
+
+// Plural represents a language pluralization form as defined here:
+// http://cldr.unicode.org/index/cldr-spec/plural-rules
+type Plural string
+
+// All defined plural categories.
+const (
+	Invalid Plural = "invalid"
+	Zero           = "zero"
+	One            = "one"
+	Two            = "two"
+	Few            = "few"
+	Many           = "many"
+	Other          = "other"
+)
+
+// NewPlural returns src as a Plural
+// or Invalid and a non-nil error if src is not a valid Plural.
+func NewPlural(src string) (Plural, error) {
+	switch src {
+	case "zero":
+		return Zero, nil
+	case "one":
+		return One, nil
+	case "two":
+		return Two, nil
+	case "few":
+		return Few, nil
+	case "many":
+		return Many, nil
+	case "other":
+		return Other, nil
+	}
+	return Invalid, fmt.Errorf("invalid plural category %s", src)
+}
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/language/pluralspec.go b/vendor/github.com/mattermost/go-i18n/i18n/language/pluralspec.go
new file mode 100644
index 00000000..fc31e880
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/language/pluralspec.go
@@ -0,0 +1,75 @@
+package language
+
+import "strings"
+
+// PluralSpec defines the CLDR plural rules for a language.
+// http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html
+// http://unicode.org/reports/tr35/tr35-numbers.html#Operands
+type PluralSpec struct {
+	Plurals    map[Plural]struct{}
+	PluralFunc func(*Operands) Plural
+}
+
+var pluralSpecs = make(map[string]*PluralSpec)
+
+func normalizePluralSpecID(id string) string {
+	id = strings.Replace(id, "_", "-", -1)
+	id = strings.ToLower(id)
+	return id
+}
+
+// RegisterPluralSpec registers a new plural spec for the language ids.
+func RegisterPluralSpec(ids []string, ps *PluralSpec) {
+	for _, id := range ids {
+		id = normalizePluralSpecID(id)
+		pluralSpecs[id] = ps
+	}
+}
+
+// Plural returns the plural category for number as defined by
+// the language's CLDR plural rules.
+func (ps *PluralSpec) Plural(number interface{}) (Plural, error) {
+	ops, err := newOperands(number)
+	if err != nil {
+		return Invalid, err
+	}
+	return ps.PluralFunc(ops), nil
+}
+
+// GetPluralSpec returns the PluralSpec that matches the longest prefix of tag.
+// It returns nil if no PluralSpec matches tag.
+func GetPluralSpec(tag string) *PluralSpec {
+	tag = NormalizeTag(tag)
+	subtag := tag
+	for {
+		if spec := pluralSpecs[subtag]; spec != nil {
+			return spec
+		}
+		end := strings.LastIndex(subtag, "-")
+		if end == -1 {
+			return nil
+		}
+		subtag = subtag[:end]
+	}
+}
+
+func newPluralSet(plurals ...Plural) map[Plural]struct{} {
+	set := make(map[Plural]struct{}, len(plurals))
+	for _, plural := range plurals {
+		set[plural] = struct{}{}
+	}
+	return set
+}
+
+func intInRange(i, from, to int64) bool {
+	return from <= i && i <= to
+}
+
+func intEqualsAny(i int64, any ...int64) bool {
+	for _, a := range any {
+		if i == a {
+			return true
+		}
+	}
+	return false
+}
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/language/pluralspec_gen.go b/vendor/github.com/mattermost/go-i18n/i18n/language/pluralspec_gen.go
new file mode 100644
index 00000000..0268bb92
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/language/pluralspec_gen.go
@@ -0,0 +1,557 @@
+package language
+
+// This file is generated by i18n/language/codegen/generate.sh
+
+func init() {
+
+	RegisterPluralSpec([]string{"bm", "bo", "dz", "id", "ig", "ii", "in", "ja", "jbo", "jv", "jw", "kde", "kea", "km", "ko", "lkt", "lo", "ms", "my", "nqo", "root", "sah", "ses", "sg", "th", "to", "vi", "wo", "yo", "yue", "zh"}, &PluralSpec{
+		Plurals: newPluralSet(Other),
+		PluralFunc: func(ops *Operands) Plural {
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"am", "as", "bn", "fa", "gu", "hi", "kn", "mr", "zu"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 0 or n = 1
+			if intEqualsAny(ops.I, 0) ||
+				ops.NequalsAny(1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"ff", "fr", "hy", "kab"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 0,1
+			if intEqualsAny(ops.I, 0, 1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"pt"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 0..1
+			if intInRange(ops.I, 0, 1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"ast", "ca", "de", "en", "et", "fi", "fy", "gl", "it", "ji", "nl", "sv", "sw", "ur", "yi"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 1 and v = 0
+			if intEqualsAny(ops.I, 1) && intEqualsAny(ops.V, 0) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"si"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 0,1 or i = 0 and f = 1
+			if ops.NequalsAny(0, 1) ||
+				intEqualsAny(ops.I, 0) && intEqualsAny(ops.F, 1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"ak", "bh", "guw", "ln", "mg", "nso", "pa", "ti", "wa"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 0..1
+			if ops.NinRange(0, 1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"tzm"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 0..1 or n = 11..99
+			if ops.NinRange(0, 1) ||
+				ops.NinRange(11, 99) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"af", "asa", "az", "bem", "bez", "bg", "brx", "ce", "cgg", "chr", "ckb", "dv", "ee", "el", "eo", "es", "eu", "fo", "fur", "gsw", "ha", "haw", "hu", "jgo", "jmc", "ka", "kaj", "kcg", "kk", "kkj", "kl", "ks", "ksb", "ku", "ky", "lb", "lg", "mas", "mgo", "ml", "mn", "nah", "nb", "nd", "ne", "nn", "nnh", "no", "nr", "ny", "nyn", "om", "or", "os", "pap", "ps", "rm", "rof", "rwk", "saq", "sdh", "seh", "sn", "so", "sq", "ss", "ssy", "st", "syr", "ta", "te", "teo", "tig", "tk", "tn", "tr", "ts", "ug", "uz", "ve", "vo", "vun", "wae", "xh", "xog"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 1
+			if ops.NequalsAny(1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"da"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 1 or t != 0 and i = 0,1
+			if ops.NequalsAny(1) ||
+				!intEqualsAny(ops.T, 0) && intEqualsAny(ops.I, 0, 1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"is"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// t = 0 and i % 10 = 1 and i % 100 != 11 or t != 0
+			if intEqualsAny(ops.T, 0) && intEqualsAny(ops.I%10, 1) && !intEqualsAny(ops.I%100, 11) ||
+				!intEqualsAny(ops.T, 0) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"mk"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// v = 0 and i % 10 = 1 or f % 10 = 1
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%10, 1) ||
+				intEqualsAny(ops.F%10, 1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"fil", "tl"}, &PluralSpec{
+		Plurals: newPluralSet(One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// v = 0 and i = 1,2,3 or v = 0 and i % 10 != 4,6,9 or v != 0 and f % 10 != 4,6,9
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I, 1, 2, 3) ||
+				intEqualsAny(ops.V, 0) && !intEqualsAny(ops.I%10, 4, 6, 9) ||
+				!intEqualsAny(ops.V, 0) && !intEqualsAny(ops.F%10, 4, 6, 9) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"lv", "prg"}, &PluralSpec{
+		Plurals: newPluralSet(Zero, One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n % 10 = 0 or n % 100 = 11..19 or v = 2 and f % 100 = 11..19
+			if ops.NmodEqualsAny(10, 0) ||
+				ops.NmodInRange(100, 11, 19) ||
+				intEqualsAny(ops.V, 2) && intInRange(ops.F%100, 11, 19) {
+				return Zero
+			}
+			// n % 10 = 1 and n % 100 != 11 or v = 2 and f % 10 = 1 and f % 100 != 11 or v != 2 and f % 10 = 1
+			if ops.NmodEqualsAny(10, 1) && !ops.NmodEqualsAny(100, 11) ||
+				intEqualsAny(ops.V, 2) && intEqualsAny(ops.F%10, 1) && !intEqualsAny(ops.F%100, 11) ||
+				!intEqualsAny(ops.V, 2) && intEqualsAny(ops.F%10, 1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"lag"}, &PluralSpec{
+		Plurals: newPluralSet(Zero, One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 0
+			if ops.NequalsAny(0) {
+				return Zero
+			}
+			// i = 0,1 and n != 0
+			if intEqualsAny(ops.I, 0, 1) && !ops.NequalsAny(0) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"ksh"}, &PluralSpec{
+		Plurals: newPluralSet(Zero, One, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 0
+			if ops.NequalsAny(0) {
+				return Zero
+			}
+			// n = 1
+			if ops.NequalsAny(1) {
+				return One
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"iu", "kw", "naq", "se", "sma", "smi", "smj", "smn", "sms"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 1
+			if ops.NequalsAny(1) {
+				return One
+			}
+			// n = 2
+			if ops.NequalsAny(2) {
+				return Two
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"shi"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 0 or n = 1
+			if intEqualsAny(ops.I, 0) ||
+				ops.NequalsAny(1) {
+				return One
+			}
+			// n = 2..10
+			if ops.NinRange(2, 10) {
+				return Few
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"mo", "ro"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 1 and v = 0
+			if intEqualsAny(ops.I, 1) && intEqualsAny(ops.V, 0) {
+				return One
+			}
+			// v != 0 or n = 0 or n != 1 and n % 100 = 1..19
+			if !intEqualsAny(ops.V, 0) ||
+				ops.NequalsAny(0) ||
+				!ops.NequalsAny(1) && ops.NmodInRange(100, 1, 19) {
+				return Few
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"bs", "hr", "sh", "sr"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// v = 0 and i % 10 = 1 and i % 100 != 11 or f % 10 = 1 and f % 100 != 11
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%10, 1) && !intEqualsAny(ops.I%100, 11) ||
+				intEqualsAny(ops.F%10, 1) && !intEqualsAny(ops.F%100, 11) {
+				return One
+			}
+			// v = 0 and i % 10 = 2..4 and i % 100 != 12..14 or f % 10 = 2..4 and f % 100 != 12..14
+			if intEqualsAny(ops.V, 0) && intInRange(ops.I%10, 2, 4) && !intInRange(ops.I%100, 12, 14) ||
+				intInRange(ops.F%10, 2, 4) && !intInRange(ops.F%100, 12, 14) {
+				return Few
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"gd"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Few, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 1,11
+			if ops.NequalsAny(1, 11) {
+				return One
+			}
+			// n = 2,12
+			if ops.NequalsAny(2, 12) {
+				return Two
+			}
+			// n = 3..10,13..19
+			if ops.NinRange(3, 10) || ops.NinRange(13, 19) {
+				return Few
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"sl"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Few, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// v = 0 and i % 100 = 1
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%100, 1) {
+				return One
+			}
+			// v = 0 and i % 100 = 2
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%100, 2) {
+				return Two
+			}
+			// v = 0 and i % 100 = 3..4 or v != 0
+			if intEqualsAny(ops.V, 0) && intInRange(ops.I%100, 3, 4) ||
+				!intEqualsAny(ops.V, 0) {
+				return Few
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"dsb", "hsb"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Few, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// v = 0 and i % 100 = 1 or f % 100 = 1
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%100, 1) ||
+				intEqualsAny(ops.F%100, 1) {
+				return One
+			}
+			// v = 0 and i % 100 = 2 or f % 100 = 2
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%100, 2) ||
+				intEqualsAny(ops.F%100, 2) {
+				return Two
+			}
+			// v = 0 and i % 100 = 3..4 or f % 100 = 3..4
+			if intEqualsAny(ops.V, 0) && intInRange(ops.I%100, 3, 4) ||
+				intInRange(ops.F%100, 3, 4) {
+				return Few
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"he", "iw"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 1 and v = 0
+			if intEqualsAny(ops.I, 1) && intEqualsAny(ops.V, 0) {
+				return One
+			}
+			// i = 2 and v = 0
+			if intEqualsAny(ops.I, 2) && intEqualsAny(ops.V, 0) {
+				return Two
+			}
+			// v = 0 and n != 0..10 and n % 10 = 0
+			if intEqualsAny(ops.V, 0) && !ops.NinRange(0, 10) && ops.NmodEqualsAny(10, 0) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"cs", "sk"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 1 and v = 0
+			if intEqualsAny(ops.I, 1) && intEqualsAny(ops.V, 0) {
+				return One
+			}
+			// i = 2..4 and v = 0
+			if intInRange(ops.I, 2, 4) && intEqualsAny(ops.V, 0) {
+				return Few
+			}
+			// v != 0
+			if !intEqualsAny(ops.V, 0) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"pl"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// i = 1 and v = 0
+			if intEqualsAny(ops.I, 1) && intEqualsAny(ops.V, 0) {
+				return One
+			}
+			// v = 0 and i % 10 = 2..4 and i % 100 != 12..14
+			if intEqualsAny(ops.V, 0) && intInRange(ops.I%10, 2, 4) && !intInRange(ops.I%100, 12, 14) {
+				return Few
+			}
+			// v = 0 and i != 1 and i % 10 = 0..1 or v = 0 and i % 10 = 5..9 or v = 0 and i % 100 = 12..14
+			if intEqualsAny(ops.V, 0) && !intEqualsAny(ops.I, 1) && intInRange(ops.I%10, 0, 1) ||
+				intEqualsAny(ops.V, 0) && intInRange(ops.I%10, 5, 9) ||
+				intEqualsAny(ops.V, 0) && intInRange(ops.I%100, 12, 14) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"be"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n % 10 = 1 and n % 100 != 11
+			if ops.NmodEqualsAny(10, 1) && !ops.NmodEqualsAny(100, 11) {
+				return One
+			}
+			// n % 10 = 2..4 and n % 100 != 12..14
+			if ops.NmodInRange(10, 2, 4) && !ops.NmodInRange(100, 12, 14) {
+				return Few
+			}
+			// n % 10 = 0 or n % 10 = 5..9 or n % 100 = 11..14
+			if ops.NmodEqualsAny(10, 0) ||
+				ops.NmodInRange(10, 5, 9) ||
+				ops.NmodInRange(100, 11, 14) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"lt"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n % 10 = 1 and n % 100 != 11..19
+			if ops.NmodEqualsAny(10, 1) && !ops.NmodInRange(100, 11, 19) {
+				return One
+			}
+			// n % 10 = 2..9 and n % 100 != 11..19
+			if ops.NmodInRange(10, 2, 9) && !ops.NmodInRange(100, 11, 19) {
+				return Few
+			}
+			// f != 0
+			if !intEqualsAny(ops.F, 0) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"mt"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 1
+			if ops.NequalsAny(1) {
+				return One
+			}
+			// n = 0 or n % 100 = 2..10
+			if ops.NequalsAny(0) ||
+				ops.NmodInRange(100, 2, 10) {
+				return Few
+			}
+			// n % 100 = 11..19
+			if ops.NmodInRange(100, 11, 19) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"ru", "uk"}, &PluralSpec{
+		Plurals: newPluralSet(One, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// v = 0 and i % 10 = 1 and i % 100 != 11
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%10, 1) && !intEqualsAny(ops.I%100, 11) {
+				return One
+			}
+			// v = 0 and i % 10 = 2..4 and i % 100 != 12..14
+			if intEqualsAny(ops.V, 0) && intInRange(ops.I%10, 2, 4) && !intInRange(ops.I%100, 12, 14) {
+				return Few
+			}
+			// v = 0 and i % 10 = 0 or v = 0 and i % 10 = 5..9 or v = 0 and i % 100 = 11..14
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%10, 0) ||
+				intEqualsAny(ops.V, 0) && intInRange(ops.I%10, 5, 9) ||
+				intEqualsAny(ops.V, 0) && intInRange(ops.I%100, 11, 14) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"br"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n % 10 = 1 and n % 100 != 11,71,91
+			if ops.NmodEqualsAny(10, 1) && !ops.NmodEqualsAny(100, 11, 71, 91) {
+				return One
+			}
+			// n % 10 = 2 and n % 100 != 12,72,92
+			if ops.NmodEqualsAny(10, 2) && !ops.NmodEqualsAny(100, 12, 72, 92) {
+				return Two
+			}
+			// n % 10 = 3..4,9 and n % 100 != 10..19,70..79,90..99
+			if (ops.NmodInRange(10, 3, 4) || ops.NmodEqualsAny(10, 9)) && !(ops.NmodInRange(100, 10, 19) || ops.NmodInRange(100, 70, 79) || ops.NmodInRange(100, 90, 99)) {
+				return Few
+			}
+			// n != 0 and n % 1000000 = 0
+			if !ops.NequalsAny(0) && ops.NmodEqualsAny(1000000, 0) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"ga"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 1
+			if ops.NequalsAny(1) {
+				return One
+			}
+			// n = 2
+			if ops.NequalsAny(2) {
+				return Two
+			}
+			// n = 3..6
+			if ops.NinRange(3, 6) {
+				return Few
+			}
+			// n = 7..10
+			if ops.NinRange(7, 10) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"gv"}, &PluralSpec{
+		Plurals: newPluralSet(One, Two, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// v = 0 and i % 10 = 1
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%10, 1) {
+				return One
+			}
+			// v = 0 and i % 10 = 2
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%10, 2) {
+				return Two
+			}
+			// v = 0 and i % 100 = 0,20,40,60,80
+			if intEqualsAny(ops.V, 0) && intEqualsAny(ops.I%100, 0, 20, 40, 60, 80) {
+				return Few
+			}
+			// v != 0
+			if !intEqualsAny(ops.V, 0) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"ar", "ars"}, &PluralSpec{
+		Plurals: newPluralSet(Zero, One, Two, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 0
+			if ops.NequalsAny(0) {
+				return Zero
+			}
+			// n = 1
+			if ops.NequalsAny(1) {
+				return One
+			}
+			// n = 2
+			if ops.NequalsAny(2) {
+				return Two
+			}
+			// n % 100 = 3..10
+			if ops.NmodInRange(100, 3, 10) {
+				return Few
+			}
+			// n % 100 = 11..99
+			if ops.NmodInRange(100, 11, 99) {
+				return Many
+			}
+			return Other
+		},
+	})
+	RegisterPluralSpec([]string{"cy"}, &PluralSpec{
+		Plurals: newPluralSet(Zero, One, Two, Few, Many, Other),
+		PluralFunc: func(ops *Operands) Plural {
+			// n = 0
+			if ops.NequalsAny(0) {
+				return Zero
+			}
+			// n = 1
+			if ops.NequalsAny(1) {
+				return One
+			}
+			// n = 2
+			if ops.NequalsAny(2) {
+				return Two
+			}
+			// n = 3
+			if ops.NequalsAny(3) {
+				return Few
+			}
+			// n = 6
+			if ops.NequalsAny(6) {
+				return Many
+			}
+			return Other
+		},
+	})
+}
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/translation/plural_translation.go b/vendor/github.com/mattermost/go-i18n/i18n/translation/plural_translation.go
new file mode 100644
index 00000000..86e89962
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/translation/plural_translation.go
@@ -0,0 +1,82 @@
+package translation
+
+import (
+	"github.com/mattermost/go-i18n/i18n/language"
+)
+
+type pluralTranslation struct {
+	id        string
+	templates map[language.Plural]*template
+}
+
+func (pt *pluralTranslation) MarshalInterface() interface{} {
+	return map[string]interface{}{
+		"id":          pt.id,
+		"translation": pt.templates,
+	}
+}
+
+func (pt *pluralTranslation) MarshalFlatInterface() interface{} {
+	return pt.templates
+}
+
+func (pt *pluralTranslation) ID() string {
+	return pt.id
+}
+
+func (pt *pluralTranslation) Template(pc language.Plural) *template {
+	return pt.templates[pc]
+}
+
+func (pt *pluralTranslation) UntranslatedCopy() Translation {
+	return &pluralTranslation{pt.id, make(map[language.Plural]*template)}
+}
+
+func (pt *pluralTranslation) Normalize(l *language.Language) Translation {
+	// Delete plural categories that don't belong to this language.
+	for pc := range pt.templates {
+		if _, ok := l.Plurals[pc]; !ok {
+			delete(pt.templates, pc)
+		}
+	}
+	// Create map entries for missing valid categories.
+	for pc := range l.Plurals {
+		if _, ok := pt.templates[pc]; !ok {
+			pt.templates[pc] = mustNewTemplate("")
+		}
+	}
+	return pt
+}
+
+func (pt *pluralTranslation) Backfill(src Translation) Translation {
+	for pc, t := range pt.templates {
+		if (t == nil || t.src == "") && src != nil {
+			pt.templates[pc] = src.Template(language.Other)
+		}
+	}
+	return pt
+}
+
+func (pt *pluralTranslation) Merge(t Translation) Translation {
+	other, ok := t.(*pluralTranslation)
+	if !ok || pt.ID() != t.ID() {
+		return t
+	}
+	for pluralCategory, template := range other.templates {
+		if template != nil && template.src != "" {
+			pt.templates[pluralCategory] = template
+		}
+	}
+	return pt
+}
+
+func (pt *pluralTranslation) Incomplete(l *language.Language) bool {
+	for pc := range l.Plurals {
+		if t := pt.templates[pc]; t == nil || t.src == "" {
+			return true
+		}
+	}
+	return false
+}
+
+var _ = Translation(&pluralTranslation{})
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/translation/single_translation.go b/vendor/github.com/mattermost/go-i18n/i18n/translation/single_translation.go
new file mode 100644
index 00000000..f2fab623
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/translation/single_translation.go
@@ -0,0 +1,61 @@
+package translation
+
+import (
+	"github.com/mattermost/go-i18n/i18n/language"
+)
+
+type singleTranslation struct {
+	id       string
+	template *template
+}
+
+func (st *singleTranslation) MarshalInterface() interface{} {
+	return map[string]interface{}{
+		"id":          st.id,
+		"translation": st.template,
+	}
+}
+
+func (st *singleTranslation) MarshalFlatInterface() interface{} {
+	return map[string]interface{}{"other": st.template}
+}
+
+func (st *singleTranslation) ID() string {
+	return st.id
+}
+
+func (st *singleTranslation) Template(pc language.Plural) *template {
+	return st.template
+}
+
+func (st *singleTranslation) UntranslatedCopy() Translation {
+	return &singleTranslation{st.id, mustNewTemplate("")}
+}
+
+func (st *singleTranslation) Normalize(language *language.Language) Translation {
+	return st
+}
+
+func (st *singleTranslation) Backfill(src Translation) Translation {
+	if (st.template == nil || st.template.src == "") && src != nil {
+		st.template = src.Template(language.Other)
+	}
+	return st
+}
+
+func (st *singleTranslation) Merge(t Translation) Translation {
+	other, ok := t.(*singleTranslation)
+	if !ok || st.ID() != t.ID() {
+		return t
+	}
+	if other.template != nil && other.template.src != "" {
+		st.template = other.template
+	}
+	return st
+}
+
+func (st *singleTranslation) Incomplete(l *language.Language) bool {
+	return st.template == nil || st.template.src == ""
+}
+
+var _ = Translation(&singleTranslation{})
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/translation/template.go b/vendor/github.com/mattermost/go-i18n/i18n/translation/template.go
new file mode 100644
index 00000000..3310150c
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/translation/template.go
@@ -0,0 +1,65 @@
+package translation
+
+import (
+	"bytes"
+	"encoding"
+	"strings"
+	gotemplate "text/template"
+)
+
+type template struct {
+	tmpl *gotemplate.Template
+	src  string
+}
+
+func newTemplate(src string) (*template, error) {
+	if src == "" {
+		return new(template), nil
+	}
+
+	var tmpl template
+	err := tmpl.parseTemplate(src)
+	return &tmpl, err
+}
+
+func mustNewTemplate(src string) *template {
+	t, err := newTemplate(src)
+	if err != nil {
+		panic(err)
+	}
+	return t
+}
+
+func (t *template) String() string {
+	return t.src
+}
+
+func (t *template) Execute(args interface{}) string {
+	if t.tmpl == nil {
+		return t.src
+	}
+	var buf bytes.Buffer
+	if err := t.tmpl.Execute(&buf, args); err != nil {
+		return err.Error()
+	}
+	return buf.String()
+}
+
+func (t *template) MarshalText() ([]byte, error) {
+	return []byte(t.src), nil
+}
+
+func (t *template) UnmarshalText(src []byte) error {
+	return t.parseTemplate(string(src))
+}
+
+func (t *template) parseTemplate(src string) (err error) {
+	t.src = src
+	if strings.Contains(src, "{{") {
+		t.tmpl, err = gotemplate.New(src).Parse(src)
+	}
+	return
+}
+
+var _ = encoding.TextMarshaler(&template{})
+var _ = encoding.TextUnmarshaler(&template{})
diff --git a/vendor/github.com/mattermost/go-i18n/i18n/translation/translation.go b/vendor/github.com/mattermost/go-i18n/i18n/translation/translation.go
new file mode 100644
index 00000000..9c7fd49e
--- /dev/null
+++ b/vendor/github.com/mattermost/go-i18n/i18n/translation/translation.go
@@ -0,0 +1,84 @@
+// Package translation defines the interface for a translation.
+package translation
+
+import (
+	"fmt"
+
+	"github.com/mattermost/go-i18n/i18n/language"
+)
+
+// Translation is the interface that represents a translated string.
+type Translation interface {
+	// MarshalInterface returns the object that should be used
+	// to serialize the translation.
+	MarshalInterface() interface{}
+	MarshalFlatInterface() interface{}
+	ID() string
+	Template(language.Plural) *template
+	UntranslatedCopy() Translation
+	Normalize(language *language.Language) Translation
+	Backfill(src Translation) Translation
+	Merge(Translation) Translation
+	Incomplete(l *language.Language) bool
+}
+
+// SortableByID implements sort.Interface for a slice of translations.
+type SortableByID []Translation
+
+func (a SortableByID) Len() int           { return len(a) }
+func (a SortableByID) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a SortableByID) Less(i, j int) bool { return a[i].ID() < a[j].ID() }
+
+// NewTranslation reflects on data to create a new Translation.
+//
+// data["id"] must be a string and data["translation"] must be either a string
+// for a non-plural translation or a map[string]interface{} for a plural translation.
+func NewTranslation(data map[string]interface{}) (Translation, error) {
+	id, ok := data["id"].(string)
+	if !ok {
+		return nil, fmt.Errorf(`missing "id" key`)
+	}
+	var pluralObject map[string]interface{}
+	switch translation := data["translation"].(type) {
+	case string:
+		tmpl, err := newTemplate(translation)
+		if err != nil {
+			return nil, err
+		}
+		return &singleTranslation{id, tmpl}, nil
+	case map[interface{}]interface{}:
+		// The YAML parser uses interface{} keys so we first convert them to string keys.
+		pluralObject = make(map[string]interface{})
+		for k, v := range translation {
+			kstr, ok := k.(string)
+			if !ok {
+				return nil, fmt.Errorf(`invalid plural category type %T; expected string`, k)
+			}
+			pluralObject[kstr] = v
+		}
+	case map[string]interface{}:
+		pluralObject = translation
+	case nil:
+		return nil, fmt.Errorf(`missing "translation" key`)
+	default:
+		return nil, fmt.Errorf(`unsupported type for "translation" key %T`, translation)
+	}
+
+	templates := make(map[language.Plural]*template, len(pluralObject))
+	for k, v := range pluralObject {
+		pc, err := language.NewPlural(k)
+		if err != nil {
+			return nil, err
+		}
+		str, ok := v.(string)
+		if !ok {
+			return nil, fmt.Errorf(`plural category "%s" has value of type %T; expected string`, pc, v)
+		}
+		tmpl, err := newTemplate(str)
+		if err != nil {
+			return nil, err
+		}
+		templates[pc] = tmpl
+	}
+	return &pluralTranslation{id, templates}, nil
+}