Crashlands 2 is a big game with a ton of text, so we can't support every language we'd like to. We picked the languages we're supporting at launch (English, Chinese (Simplified and Traditional), Japanese, Brazilian Portuguese, Spanish (LATAM), French, German, and Russian) based on the top locales from our pre-launch Steam wishlists, and hope to add more languages after launch. If it's not launching in your language, make sure you wishlist it anyway so we know that there's interest!
The list of supported languages may have changed since this was written: for the current list of supported languages, see the Crashlands 2 Steam page.