NVivo provides the following text content languages that you can set to match the language of your data files:
Chinese (PRC), English (UK), English (US), French (France), German (Germany), Japanese (Japan), Portuguese (Brazil), Spanish (Mexico)
If the language of your files is not available as a text content language, you should set the text content language to 'Other'. See these help pages for setting text content language and stop words: Windows version | Mac version
IMPORTANT: You can still use NVivo for your data analysis even if your data files are a different language from those provided as “text content language” options – but you won’t be able to take advantage of the NVivo features of (1) spell checking and (2) finding words with the same stem or similar meanings when you run Text Search and Word Frequency queries.