Language support is up to each browser, and it generally depends on browser APIs.
- Afrikaans (af)
 - Basque (eu)
 - Bulgarian (bg)
 - Catalan (ca)
 - Arabic (Egypt) (ar-EG)
 - Arabic (Jordan) (ar-JO)
 - Arabic (Kuwait) (ar-KW)
 - Arabic (Lebanon) (ar-LB)
 - Arabic (Qatar) (ar-QA)
 - Arabic (UAE) (ar-AE)
 - Arabic (Morocco) (ar-MA)
 - Arabic (Iraq) (ar-IQ)
 - Arabic (Algeria) (ar-DZ)
 - Arabic (Bahrain) (ar-BH)
 - Arabic (Lybia) (ar-LY)
 - Arabic (Oman) (ar-OM)
 - Arabic (Saudi Arabia) (ar-SA)
 - Arabic (Tunisia) (ar-TN)
 - Arabic (Yemen) (ar-YE)
 - Czech (cs)
 - Dutch (nl-NL)
 - English (Australia) (en-AU)
 - English (Canada) (en-CA)
 - English (India) (en-IN)
 - English (New Zealand) (en-NZ)
 - English (South Africa) (en-ZA)
 - English(UK) (en-GB)
 - English(US) (en-US)
 - Finnish (fi)
 - French (fr-FR)
 - Galician (gl)
 - German (de-DE)
 - Greek (el-GR)
 - Hebrew (he)
 - Hungarian (hu)
 - Icelandic (is)
 - Italian (it-IT)
 - Indonesian (id)
 - Japanese (ja)
 - Korean (ko)
 - Latin (la)
 - Mandarin Chinese (zh-CN)
 - Traditional Taiwan (zh-TW)
 - Simplified Hong Kong (zh-HK)
 - Yue Chinese (Traditional Hong Kong) (zh-yue)
 - Malaysian (ms-MY)
 - Norwegian (no-NO)
 - Polish (pl)
 - Portuguese (pt-PT)
 - Portuguese (Brasil) (pt-br)
 - Romanian (ro-RO)
 - Russian (ru)
 - Serbian (sr-SP)
 - Slovak (sk)
 - Spanish (Argentina) (es-AR)
 - Spanish (Bolivia) (es-BO)
 - Spanish (Chile) (es-CL)
 - Spanish (Colombia) (es-CO)
 - Spanish (Costa Rica) (es-CR)
 - Spanish (Dominican Republic) (es-DO)
 - Spanish (Ecuador) (es-EC)
 - Spanish (El Salvador) (es-SV)
 - Spanish (Guatemala) (es-GT)
 - Spanish (Honduras) (es-HN)
 - Spanish (Mexico) (es-MX)
 - Spanish (Nicaragua) (es-NI)
 - Spanish (Panama) (es-PA)
 - Spanish (Paraguay) (es-PY)
 - Spanish (Peru) (es-PE)
 - Spanish (Puerto Rico) (es-PR)
 - Spanish (Spain) (es-ES)
 - Spanish (US) (es-US)
 - Spanish (Uruguay) (es-UY)
 - Spanish (Venezuela) (es-VE)
 - Swedish (sv-SE)
 - Turkish (tr)
 - Zulu (zu)
 
Often new languages and dialects are added, so keep an eye on this page.