104 languages are supported in the NL API to facilitate sentiment analysis:

Afrikaans
Albanian
Arabic
Aragonese
Armenian
Asturian
Azerbaijani
Bashkir
Basque
Bavarian
Belarusian
Bengali
Bishnupriya Manipuri
Bosnian
Breton
Bulgarian
Burmese
Catalan
Cebuano
Chechen
Chinese (Simplified)
Chinese (Traditional)
Chuvash
Croatian
Czech
Danish
Dutch
English
Estonian
Finnish
French
Galician
Georgian
German
Greek
Gujarati
Haitian
Hebrew
Hindi
Hungarian
Icelandic
Ido
Indonesian
Irish
Italian
Japanese
Javanese
Kannada
Kazakh
Kirghiz
Korean
Latin
Latvian
Lithuanian
Lombard
Low Saxon
Luxembourgish
Macedonian
Malagasy
Malay
Malayalam
Marathi
Minangkabau
Mongolian
Nepali
Newar
Norwegian (Bokmal)
Norwegian (Nynorsk)
Occitan
Persian (Farsi)
Piedmontese
Polish
Portuguese
Punjabi
Romanian
Russian
Scots
Serbian
Serbo-Croatian
Sicilian
Slovak
Slovenian
South Azerbaijani
Spanish
Sundanese
Swahili
Swedish
Tagalog
Tajik
Tamil
Tatar
Telugu
Thai
Turkish
Ukrainian
Urdu
Uzbek
Vietnamese
Volapük
Waray-Waray
Welsh
West Frisian
Western Punjabi
Yoruba