Add new and missing locales to i18n.cr

New locales: lt, vi
Missing: bn_BD, cs, da, eu, hu-HU, si, sk, sr, sr_Cyrl

src/invidious/helpers/i18n.cr

@@ -1,31 +1,42 @@
 LOCALES = {
-  "ar"    => load_locale("ar"),
-  "de"    => load_locale("de"),
-  "el"    => load_locale("el"),
-  "en-US" => load_locale("en-US"),
-  "eo"    => load_locale("eo"),
-  "es"    => load_locale("es"),
-  "fa"    => load_locale("fa"),
-  "fi"    => load_locale("fi"),
-  "fr"    => load_locale("fr"),
-  "he"    => load_locale("he"),
-  "hr"    => load_locale("hr"),
-  "id"    => load_locale("id"),
-  "is"    => load_locale("is"),
-  "it"    => load_locale("it"),
-  "ja"    => load_locale("ja"),
-  "nb-NO" => load_locale("nb-NO"),
-  "nl"    => load_locale("nl"),
-  "pl"    => load_locale("pl"),
-  "pt-BR" => load_locale("pt-BR"),
-  "pt-PT" => load_locale("pt-PT"),
-  "ro"    => load_locale("ro"),
-  "ru"    => load_locale("ru"),
-  "sv-SE" => load_locale("sv-SE"),
-  "tr"    => load_locale("tr"),
-  "uk"    => load_locale("uk"),
-  "zh-CN" => load_locale("zh-CN"),
-  "zh-TW" => load_locale("zh-TW"),
+  "ar"      => load_locale("ar"),      # Arabic
+  "bn_BD"   => load_locale("bn_BD"),   # Bengali (Bangladesh)
+  "cs"      => load_locale("cs"),      # Czech
+  "da"      => load_locale("da"),      # Danish
+  "de"      => load_locale("de"),      # German
+  "el"      => load_locale("el"),      # Greek
+  "en-US"   => load_locale("en-US"),   # English (US)
+  "eo"      => load_locale("eo"),      # Esperanto
+  "es"      => load_locale("es"),      # Spanish
+  "eu"      => load_locale("eu"),      # Basque
+  "fa"      => load_locale("fa"),      # Persian
+  "fi"      => load_locale("fi"),      # Finnish
+  "fr"      => load_locale("fr"),      # French
+  "he"      => load_locale("he"),      # Hebrew
+  "hr"      => load_locale("hr"),      # Croatian
+  "hu-HU"   => load_locale("hu-HU"),   # Hungarian
+  "id"      => load_locale("id"),      # Indonesian
+  "is"      => load_locale("is"),      # Icelandic
+  "it"      => load_locale("it"),      # Italian
+  "ja"      => load_locale("ja"),      # Japanese
+  "lt"      => load_locale("lt"),      # Lithuanian
+  "nb-NO"   => load_locale("nb-NO"),   # Norwegian Bokmål
+  "nl"      => load_locale("nl"),      # Dutch
+  "pl"      => load_locale("pl"),      # Polish
+  "pt-BR"   => load_locale("pt-BR"),   # Portuguese (Brazil)
+  "pt-PT"   => load_locale("pt-PT"),   # Portuguese (Portugal)
+  "ro"      => load_locale("ro"),      # Romanian
+  "ru"      => load_locale("ru"),      # Russian
+  "si"      => load_locale("si"),      # Sinhala
+  "sk"      => load_locale("sk"),      # Slovak
+  "sr"      => load_locale("sr"),      # Serbian
+  "sr_Cyrl" => load_locale("sr_Cyrl"), # Serbian (cyrillic)
+  "sv-SE"   => load_locale("sv-SE"),   # Swedish
+  "tr"      => load_locale("tr"),      # Turkish
+  "uk"      => load_locale("uk"),      # Ukrainian
+  "vi"      => load_locale("vi"),      # Vietnamese
+  "zh-CN"   => load_locale("zh-CN"),   # Chinese (Simplified)
+  "zh-TW"   => load_locale("zh-TW"),   # Chinese (Traditional)
 }
 
 def load_locale(name)