Arabic
Belarusian
Bulgarian
Bengali
Catalan
Czech
Danish
German
Greek
English
English (Australian)
English (Great Britain)
Spanish
Basque
Farsi
Finnish
Filipino
French
Galician
Gujarati
Hindi
Croatian
Hungarian
Indonesian
Italian
Hebrew
Japanese
Kazakh
Kannada
Korean
Kyrgyz
Lithuanian
Latvian
Macedonian
Malayalam
Marathi
Burmese
Dutch
Norwegian
Punjabi
Polish
Portuguese
Portuguese (Brazil)
Portuguese (Portugal)
Romanian
Russian
Slovak
Slovenian
Albanian
Serbian
Swedish
Tamil
Telugu
Thai
Tagalog
Turkish
Ukrainian
Uzbek
Vietnamese
Chinese (Simlified)
Chinese (Traditional)
By default the API will attempt to load the most appropriate language based on the users location or browser settings. Some APIs allow you to explicitly set a language when you make a request
See
https://developers.google.com/maps/faq#languagesupport