diff --git a/vendor/golang.org/x/text/language/tags.go b/vendor/golang.org/x/text/language/tags.go
new file mode 100644
index 0000000..42ea792
--- /dev/null
+++ b/vendor/golang.org/x/text/language/tags.go
@@ -0,0 +1,145 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package language
+
+import "golang.org/x/text/internal/language/compact"
+
+// TODO: Various sets of commonly use tags and regions.
+
+// MustParse is like Parse, but panics if the given BCP 47 tag cannot be parsed.
+// It simplifies safe initialization of Tag values.
+func MustParse(s string) Tag {
+	t, err := Parse(s)
+	if err != nil {
+		panic(err)
+	}
+	return t
+}
+
+// MustParse is like Parse, but panics if the given BCP 47 tag cannot be parsed.
+// It simplifies safe initialization of Tag values.
+func (c CanonType) MustParse(s string) Tag {
+	t, err := c.Parse(s)
+	if err != nil {
+		panic(err)
+	}
+	return t
+}
+
+// MustParseBase is like ParseBase, but panics if the given base cannot be parsed.
+// It simplifies safe initialization of Base values.
+func MustParseBase(s string) Base {
+	b, err := ParseBase(s)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
+
+// MustParseScript is like ParseScript, but panics if the given script cannot be
+// parsed. It simplifies safe initialization of Script values.
+func MustParseScript(s string) Script {
+	scr, err := ParseScript(s)
+	if err != nil {
+		panic(err)
+	}
+	return scr
+}
+
+// MustParseRegion is like ParseRegion, but panics if the given region cannot be
+// parsed. It simplifies safe initialization of Region values.
+func MustParseRegion(s string) Region {
+	r, err := ParseRegion(s)
+	if err != nil {
+		panic(err)
+	}
+	return r
+}
+
+var (
+	und = Tag{}
+
+	Und Tag = Tag{}
+
+	Afrikaans            Tag = Tag(compact.Afrikaans)
+	Amharic              Tag = Tag(compact.Amharic)
+	Arabic               Tag = Tag(compact.Arabic)
+	ModernStandardArabic Tag = Tag(compact.ModernStandardArabic)
+	Azerbaijani          Tag = Tag(compact.Azerbaijani)
+	Bulgarian            Tag = Tag(compact.Bulgarian)
+	Bengali              Tag = Tag(compact.Bengali)
+	Catalan              Tag = Tag(compact.Catalan)
+	Czech                Tag = Tag(compact.Czech)
+	Danish               Tag = Tag(compact.Danish)
+	German               Tag = Tag(compact.German)
+	Greek                Tag = Tag(compact.Greek)
+	English              Tag = Tag(compact.English)
+	AmericanEnglish      Tag = Tag(compact.AmericanEnglish)
+	BritishEnglish       Tag = Tag(compact.BritishEnglish)
+	Spanish              Tag = Tag(compact.Spanish)
+	EuropeanSpanish      Tag = Tag(compact.EuropeanSpanish)
+	LatinAmericanSpanish Tag = Tag(compact.LatinAmericanSpanish)
+	Estonian             Tag = Tag(compact.Estonian)
+	Persian              Tag = Tag(compact.Persian)
+	Finnish              Tag = Tag(compact.Finnish)
+	Filipino             Tag = Tag(compact.Filipino)
+	French               Tag = Tag(compact.French)
+	CanadianFrench       Tag = Tag(compact.CanadianFrench)
+	Gujarati             Tag = Tag(compact.Gujarati)
+	Hebrew               Tag = Tag(compact.Hebrew)
+	Hindi                Tag = Tag(compact.Hindi)
+	Croatian             Tag = Tag(compact.Croatian)
+	Hungarian            Tag = Tag(compact.Hungarian)
+	Armenian             Tag = Tag(compact.Armenian)
+	Indonesian           Tag = Tag(compact.Indonesian)
+	Icelandic            Tag = Tag(compact.Icelandic)
+	Italian              Tag = Tag(compact.Italian)
+	Japanese             Tag = Tag(compact.Japanese)
+	Georgian             Tag = Tag(compact.Georgian)
+	Kazakh               Tag = Tag(compact.Kazakh)
+	Khmer                Tag = Tag(compact.Khmer)
+	Kannada              Tag = Tag(compact.Kannada)
+	Korean               Tag = Tag(compact.Korean)
+	Kirghiz              Tag = Tag(compact.Kirghiz)
+	Lao                  Tag = Tag(compact.Lao)
+	Lithuanian           Tag = Tag(compact.Lithuanian)
+	Latvian              Tag = Tag(compact.Latvian)
+	Macedonian           Tag = Tag(compact.Macedonian)
+	Malayalam            Tag = Tag(compact.Malayalam)
+	Mongolian            Tag = Tag(compact.Mongolian)
+	Marathi              Tag = Tag(compact.Marathi)
+	Malay                Tag = Tag(compact.Malay)
+	Burmese              Tag = Tag(compact.Burmese)
+	Nepali               Tag = Tag(compact.Nepali)
+	Dutch                Tag = Tag(compact.Dutch)
+	Norwegian            Tag = Tag(compact.Norwegian)
+	Punjabi              Tag = Tag(compact.Punjabi)
+	Polish               Tag = Tag(compact.Polish)
+	Portuguese           Tag = Tag(compact.Portuguese)
+	BrazilianPortuguese  Tag = Tag(compact.BrazilianPortuguese)
+	EuropeanPortuguese   Tag = Tag(compact.EuropeanPortuguese)
+	Romanian             Tag = Tag(compact.Romanian)
+	Russian              Tag = Tag(compact.Russian)
+	Sinhala              Tag = Tag(compact.Sinhala)
+	Slovak               Tag = Tag(compact.Slovak)
+	Slovenian            Tag = Tag(compact.Slovenian)
+	Albanian             Tag = Tag(compact.Albanian)
+	Serbian              Tag = Tag(compact.Serbian)
+	SerbianLatin         Tag = Tag(compact.SerbianLatin)
+	Swedish              Tag = Tag(compact.Swedish)
+	Swahili              Tag = Tag(compact.Swahili)
+	Tamil                Tag = Tag(compact.Tamil)
+	Telugu               Tag = Tag(compact.Telugu)
+	Thai                 Tag = Tag(compact.Thai)
+	Turkish              Tag = Tag(compact.Turkish)
+	Ukrainian            Tag = Tag(compact.Ukrainian)
+	Urdu                 Tag = Tag(compact.Urdu)
+	Uzbek                Tag = Tag(compact.Uzbek)
+	Vietnamese           Tag = Tag(compact.Vietnamese)
+	Chinese              Tag = Tag(compact.Chinese)
+	SimplifiedChinese    Tag = Tag(compact.SimplifiedChinese)
+	TraditionalChinese   Tag = Tag(compact.TraditionalChinese)
+	Zulu                 Tag = Tag(compact.Zulu)
+)