In addition to the original English, Simplified Chinese, and Traditional Chinese, the demo now supports Japanese, Korean, French, Italian, German, Spanish-Spain, Portuguese-Portugal, Portuguese-Brazil, Spanish-Latin America, Dutch, Turkish, Ukrainian, Russian, and Vietnamese, bringing the total to 17 languages as listed on the store page!
There may be some oversights in the localized content. Please feel free to point them out! You can leave your feedback in the "Language Feedback" section of the game’s Steam discussion forum. The link is: