Remove language detection through cld3 (#17478)

* Remove language detection through cld3

* Update app/helpers/languages_helper.rb

Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

2 files changed, 218 insertions, 75 deletions

diff --git a/app/helpers/languages_helper.rb b/app/helpers/languages_helper.rb
index 730724208..f3ed7b314 100644
--- a/app/helpers/languages_helper.rb
+++ b/app/helpers/languages_helper.rb
@@ -1,94 +1,237 @@
 # frozen_string_literal: true
 
 module LanguagesHelper
-  HUMAN_LOCALES = {
-    af: 'Afrikaans',
-    ar: 'العربية',
-    ast: 'Asturianu',
-    bg: 'Български',
-    bn: 'বাংলা',
-    br: 'Breton',
-    ca: 'Català',
-    co: 'Corsu',
-    cs: 'Čeština',
-    cy: 'Cymraeg',
-    da: 'Dansk',
-    de: 'Deutsch',
-    el: 'Ελληνικά',
-    en: 'English',
-    eo: 'Esperanto',
+  ISO_639_1 = {
+    aa: ['Afar', 'Afaraf'].freeze,
+    ab: ['Abkhaz', 'аҧсуа бызшәа'].freeze,
+    ae: ['Avestan', 'avesta'].freeze,
+    af: ['Afrikaans', 'Afrikaans'].freeze,
+    ak: ['Akan', 'Akan'].freeze,
+    am: ['Amharic', 'አማርኛ'].freeze,
+    an: ['Aragonese', 'aragonés'].freeze,
+    ar: ['Arabic', 'اللغة العربية'].freeze,
+    as: ['Assamese', 'অসমীয়া'].freeze,
+    av: ['Avaric', 'авар мацӀ'].freeze,
+    ay: ['Aymara', 'aymar aru'].freeze,
+    az: ['Azerbaijani', 'azərbaycan dili'].freeze,
+    ba: ['Bashkir', 'башҡорт теле'].freeze,
+    be: ['Belarusian', 'беларуская мова'].freeze,
+    bg: ['Bulgarian', 'български език'].freeze,
+    bh: ['Bihari', 'भोजपुरी'].freeze,
+    bi: ['Bislama', 'Bislama'].freeze,
+    bm: ['Bambara', 'bamanankan'].freeze,
+    bn: ['Bengali', 'বাংলা'].freeze,
+    bo: ['Tibetan', 'བོད་ཡིག'].freeze,
+    br: ['Breton', 'brezhoneg'].freeze,
+    bs: ['Bosnian', 'bosanski jezik'].freeze,
+    ca: ['Catalan', 'Català'].freeze,
+    ce: ['Chechen', 'нохчийн мотт'].freeze,
+    ch: ['Chamorro', 'Chamoru'].freeze,
+    co: ['Corsican', 'corsu'].freeze,
+    cr: ['Cree', 'ᓀᐦᐃᔭᐍᐏᐣ'].freeze,
+    cs: ['Czech', 'čeština'].freeze,
+    cu: ['Old Church Slavonic', 'ѩзыкъ словѣньскъ'].freeze,
+    cv: ['Chuvash', 'чӑваш чӗлхи'].freeze,
+    cy: ['Welsh', 'Cymraeg'].freeze,
+    da: ['Danish', 'dansk'].freeze,
+    de: ['German', 'Deutsch'].freeze,
+    dv: ['Divehi', 'Dhivehi'].freeze,
+    dz: ['Dzongkha', 'རྫོང་ཁ'].freeze,
+    ee: ['Ewe', 'Eʋegbe'].freeze,
+    el: ['Greek', 'Ελληνικά'].freeze,
+    en: ['English', 'English'].freeze,
+    eo: ['Esperanto', 'Esperanto'].freeze,
+    es: ['Spanish', 'Español'].freeze,
+    et: ['Estonian', 'eesti'].freeze,
+    eu: ['Basque', 'euskara'].freeze,
+    fa: ['Persian', 'فارسی'].freeze,
+    ff: ['Fula', 'Fulfulde'].freeze,
+    fi: ['Finnish', 'suomi'].freeze,
+    fj: ['Fijian', 'Vakaviti'].freeze,
+    fo: ['Faroese', 'føroyskt'].freeze,
+    fr: ['French', 'Français'].freeze,
+    fy: ['Western Frisian', 'Frysk'].freeze,
+    ga: ['Irish', 'Gaeilge'].freeze,
+    gd: ['Scottish Gaelic', 'Gàidhlig'].freeze,
+    gl: ['Galician', 'galego'].freeze,
+    gu: ['Gujarati', 'ગુજરાતી'].freeze,
+    gv: ['Manx', 'Gaelg'].freeze,
+    ha: ['Hausa', 'هَوُسَ'].freeze,
+    he: ['Hebrew', 'עברית'].freeze,
+    hi: ['Hindi', 'हिन्दी'].freeze,
+    ho: ['Hiri Motu', 'Hiri Motu'].freeze,
+    hr: ['Croatian', 'Hrvatski'].freeze,
+    ht: ['Haitian', 'Kreyòl ayisyen'].freeze,
+    hu: ['Hungarian', 'magyar'].freeze,
+    hy: ['Armenian', 'Հայերեն'].freeze,
+    hz: ['Herero', 'Otjiherero'].freeze,
+    ia: ['Interlingua', 'Interlingua'].freeze,
+    id: ['Indonesian', 'Bahasa Indonesia'].freeze,
+    ie: ['Interlingue', 'Interlingue'].freeze,
+    ig: ['Igbo', 'Asụsụ Igbo'].freeze,
+    ii: ['Nuosu', 'ꆈꌠ꒿ Nuosuhxop'].freeze,
+    ik: ['Inupiaq', 'Iñupiaq'].freeze,
+    io: ['Ido', 'Ido'].freeze,
+    is: ['Icelandic', 'Íslenska'].freeze,
+    it: ['Italian', 'Italiano'].freeze,
+    iu: ['Inuktitut', 'ᐃᓄᒃᑎᑐᑦ'].freeze,
+    ja: ['Japanese', '日本語'].freeze,
+    jv: ['Javanese', 'basa Jawa'].freeze,
+    ka: ['Georgian', 'ქართული'].freeze,
+    kg: ['Kongo', 'Kikongo'].freeze,
+    ki: ['Kikuyu', 'Gĩkũyũ'].freeze,
+    kj: ['Kwanyama', 'Kuanyama'].freeze,
+    kk: ['Kazakh', 'қазақ тілі'].freeze,
+    kl: ['Kalaallisut', 'kalaallisut'].freeze,
+    km: ['Khmer', 'ខេមរភាសា'].freeze,
+    kn: ['Kannada', 'ಕನ್ನಡ'].freeze,
+    ko: ['Korean', '한국어'].freeze,
+    kr: ['Kanuri', 'Kanuri'].freeze,
+    ks: ['Kashmiri', 'कश्मीरी'].freeze,
+    ku: ['Kurdish', 'Kurdî'].freeze,
+    kv: ['Komi', 'коми кыв'].freeze,
+    kw: ['Cornish', 'Kernewek'].freeze,
+    ky: ['Kyrgyz', 'Кыргызча'].freeze,
+    la: ['Latin', 'latine'].freeze,
+    lb: ['Luxembourgish', 'Lëtzebuergesch'].freeze,
+    lg: ['Ganda', 'Luganda'].freeze,
+    li: ['Limburgish', 'Limburgs'].freeze,
+    ln: ['Lingala', 'Lingála'].freeze,
+    lo: ['Lao', 'ພາສາ'].freeze,
+    lt: ['Lithuanian', 'lietuvių kalba'].freeze,
+    lu: ['Luba-Katanga', 'Tshiluba'].freeze,
+    lv: ['Latvian', 'latviešu valoda'].freeze,
+    mg: ['Malagasy', 'fiteny malagasy'].freeze,
+    mh: ['Marshallese', 'Kajin M̧ajeļ'].freeze,
+    mi: ['Māori', 'te reo Māori'].freeze,
+    mk: ['Macedonian', 'македонски јазик'].freeze,
+    ml: ['Malayalam', 'മലയാളം'].freeze,
+    mn: ['Mongolian', 'Монгол хэл'].freeze,
+    mr: ['Marathi', 'मराठी'].freeze,
+    ms: ['Malay', 'Bahasa Malaysia'].freeze,
+    mt: ['Maltese', 'Malti'].freeze,
+    my: ['Burmese', 'ဗမာစာ'].freeze,
+    na: ['Nauru', 'Ekakairũ Naoero'].freeze,
+    nb: ['Norwegian Bokmål', 'Norsk bokmål'].freeze,
+    nd: ['Northern Ndebele', 'isiNdebele'].freeze,
+    ne: ['Nepali', 'नेपाली'].freeze,
+    ng: ['Ndonga', 'Owambo'].freeze,
+    nl: ['Dutch', 'Nederlands'].freeze,
+    nn: ['Norwegian Nynorsk', 'Norsk nynorsk'].freeze,
+    no: ['Norwegian', 'Norsk'].freeze,
+    nr: ['Southern Ndebele', 'isiNdebele'].freeze,
+    nv: ['Navajo', 'Diné bizaad'].freeze,
+    ny: ['Chichewa', 'chiCheŵa'].freeze,
+    oc: ['Occitan', 'occitan'].freeze,
+    oj: ['Ojibwe', 'ᐊᓂᔑᓈᐯᒧᐎᓐ'].freeze,
+    om: ['Oromo', 'Afaan Oromoo'].freeze,
+    or: ['Oriya', 'ଓଡ଼ିଆ'].freeze,
+    os: ['Ossetian', 'ирон æвзаг'].freeze,
+    pa: ['Panjabi', 'ਪੰਜਾਬੀ'].freeze,
+    pi: ['Pāli', 'पाऴि'].freeze,
+    pl: ['Polish', 'Polski'].freeze,
+    ps: ['Pashto', 'پښتو'].freeze,
+    pt: ['Portuguese', 'Português'].freeze,
+    qu: ['Quechua', 'Runa Simi'].freeze,
+    rm: ['Romansh', 'rumantsch grischun'].freeze,
+    rn: ['Kirundi', 'Ikirundi'].freeze,
+    ro: ['Romanian', 'Română'].freeze,
+    ru: ['Russian', 'Русский'].freeze,
+    rw: ['Kinyarwanda', 'Ikinyarwanda'].freeze,
+    sa: ['Sanskrit', 'संस्कृतम्'].freeze,
+    sc: ['Sardinian', 'sardu'].freeze,
+    sd: ['Sindhi', 'सिन्धी'].freeze,
+    se: ['Northern Sami', 'Davvisámegiella'].freeze,
+    sg: ['Sango', 'yângâ tî sängö'].freeze,
+    si: ['Sinhala', 'සිංහල'].freeze,
+    sk: ['Slovak', 'slovenčina'].freeze,
+    sl: ['Slovenian', 'slovenščina'].freeze,
+    sn: ['Shona', 'chiShona'].freeze,
+    so: ['Somali', 'Soomaaliga'].freeze,
+    sq: ['Albanian', 'Shqip'].freeze,
+    sr: ['Serbian', 'српски језик'].freeze,
+    ss: ['Swati', 'SiSwati'].freeze,
+    st: ['Southern Sotho', 'Sesotho'].freeze,
+    su: ['Sundanese', 'Basa Sunda'].freeze,
+    sv: ['Swedish', 'Svenska'].freeze,
+    sw: ['Swahili', 'Kiswahili'].freeze,
+    ta: ['Tamil', 'தமிழ்'].freeze,
+    te: ['Telugu', 'తెలుగు'].freeze,
+    tg: ['Tajik', 'тоҷикӣ'].freeze,
+    th: ['Thai', 'ไทย'].freeze,
+    ti: ['Tigrinya', 'ትግርኛ'].freeze,
+    tk: ['Turkmen', 'Türkmen'].freeze,
+    tl: ['Tagalog', 'Wikang Tagalog'].freeze,
+    tn: ['Tswana', 'Setswana'].freeze,
+    to: ['Tonga', 'faka Tonga'].freeze,
+    tr: ['Turkish', 'Türkçe'].freeze,
+    ts: ['Tsonga', 'Xitsonga'].freeze,
+    tt: ['Tatar', 'татар теле'].freeze,
+    tw: ['Twi', 'Twi'].freeze,
+    ty: ['Tahitian', 'Reo Tahiti'].freeze,
+    ug: ['Uyghur', 'ئۇيغۇرچە‎'].freeze,
+    uk: ['Ukrainian', 'Українська'].freeze,
+    ur: ['Urdu', 'اردو'].freeze,
+    uz: ['Uzbek', 'Ўзбек'].freeze,
+    ve: ['Venda', 'Tshivenḓa'].freeze,
+    vi: ['Vietnamese', 'Tiếng Việt'].freeze,
+    vo: ['Volapük', 'Volapük'].freeze,
+    wa: ['Walloon', 'walon'].freeze,
+    wo: ['Wolof', 'Wollof'].freeze,
+    xh: ['Xhosa', 'isiXhosa'].freeze,
+    yi: ['Yiddish', 'ייִדיש'].freeze,
+    yo: ['Yoruba', 'Yorùbá'].freeze,
+    za: ['Zhuang', 'Saɯ cueŋƅ'].freeze,
+    zh: ['Chinese', '中文'].freeze,
+    zu: ['Zulu', 'isiZulu'].freeze,
+  }.freeze
+
+  ISO_639_3 = {
+    ast: ['Asturian', 'Asturianu'].freeze,
+    kab: ['Kabyle', 'Taqbaylit'].freeze,
+    kmr: ['Northern Kurdish', 'Kurmancî'].freeze,
+    zgh: ['Standard Moroccan Tamazight', 'ⵜⴰⵎⴰⵣⵉⵖⵜ'].freeze,
+  }.freeze
+
+  SUPPORTED_LOCALES = {}.merge(ISO_639_1).merge(ISO_639_3).freeze
+
+  # For ISO-639-1 and ISO-639-3 language codes, we have their official
+  # names, but for some translations, we need the names of the
+  # regional variants specifically
+  REGIONAL_LOCALE_NAMES = {
     'es-AR': 'Español (Argentina)',
     'es-MX': 'Español (México)',
-    es: 'Español',
-    et: 'Eesti',
-    eu: 'Euskara',
-    fa: 'فارسی',
-    fi: 'Suomi',
-    fr: 'Français',
-    ga: 'Gaeilge',
-    gd: 'Gàidhlig',
-    gl: 'Galego',
-    he: 'עברית',
-    hi: 'हिन्दी',
-    hr: 'Hrvatski',
-    hu: 'Magyar',
-    hy: 'Հայերեն',
-    id: 'Bahasa Indonesia',
-    io: 'Ido',
-    is: 'Íslenska',
-    it: 'Italiano',
-    ja: '日本語',
-    ka: 'ქართული',
-    kab: 'Taqbaylit',
-    kk: 'Қазақша',
-    kmr: 'Kurmancî',
-    kn: 'ಕನ್ನಡ',
-    ko: '한국어',
-    ku: 'سۆرانی',
-    lt: 'Lietuvių',
-    lv: 'Latviešu',
-    mk: 'Македонски',
-    ml: 'മലയാളം',
-    mr: 'मराठी',
-    ms: 'Bahasa Melayu',
-    nl: 'Nederlands',
-    nn: 'Nynorsk',
-    no: 'Norsk',
-    oc: 'Occitan',
-    pl: 'Polski',
     'pt-BR': 'Português (Brasil)',
     'pt-PT': 'Português (Portugal)',
-    pt: 'Português',
-    ro: 'Română',
-    ru: 'Русский',
-    sa: 'संस्कृतम्',
-    sc: 'Sardu',
-    si: 'සිංහල',
-    sk: 'Slovenčina',
-    sl: 'Slovenščina',
-    sq: 'Shqip',
     'sr-Latn': 'Srpski (latinica)',
-    sr: 'Српски',
-    sv: 'Svenska',
-    ta: 'தமிழ்',
-    te: 'తెలుగు',
-    th: 'ไทย',
-    tr: 'Türkçe',
-    uk: 'Українська',
-    ur: 'اُردُو',
-    vi: 'Tiếng Việt',
-    zgh: 'ⵜⴰⵎⴰⵣⵉⵖⵜ',
     'zh-CN': '简体中文',
     'zh-HK': '繁體中文（香港）',
     'zh-TW': '繁體中文（臺灣）',
-    zh: '中文',
   }.freeze
 
   def human_locale(locale)
     if locale == 'und'
       I18n.t('generic.none')
+    elsif (supported_locale = SUPPORTED_LOCALES[locale.to_sym])
+      supported_locale[1]
+    elsif (regional_locale = REGIONAL_LOCALE_NAMES[locale.to_sym])
+      regional_locale
     else
-      HUMAN_LOCALES[locale.to_sym] || locale
+      locale
     end
   end
+
+  def valid_locale_or_nil(str)
+    return if str.blank?
+
+    code, = str.to_s.split(/[_-]/) # Strip out the region from e.g. en_US or ja-JP
+
+    return unless valid_locale?(code)
+
+    code
+  end
+
+  def valid_locale?(locale)
+    SUPPORTED_LOCALES.key?(locale.to_sym)
+  end
 end
diff --git a/app/helpers/settings_helper.rb b/app/helpers/settings_helper.rb
index 23739d1cd..3d5592867 100644
--- a/app/helpers/settings_helper.rb
+++ b/app/helpers/settings_helper.rb
@@ -2,7 +2,7 @@
 
 module SettingsHelper
   def filterable_languages
-    LanguageDetector.instance.language_names.select(&LanguagesHelper::HUMAN_LOCALES.method(:key?))
+    LanguagesHelper::SUPPORTED_LOCALES.keys
   end
 
   def hash_to_object(hash)