See full release announcement: https://steamcommunity.com/games/455980/announcements/detail/2856847422533231229
Survivors, we come bearing news.
Surviving in the apocalypse is hard enough as it is, so we want to make it a little bit easier. We want you to be able to survive (or try to) in your own language.

In the rapidly approaching full release, we will be adding official support for the French language, in addition to the existing official translations to German and Chinese. Special thanks again to those who helped support these languages before we created official translations - ZombieKingdom (Chinese), and Senhar (French).
In addition, we are working with modders that created the Spanish, Italian and Russian languages, to integrate their translations directly into the game, so you won't need to download the mods from the workshop. Special thanks to Nivaska (Russian), Darth Vader (Italian) and Siodog (Spanish).
If any of you want to help translate to additional languages, please drop us an email to [email protected], or come chat with us on our discord server. I would also like to thank all our other modders, that added cool game modes, languages, and other improvements to the game.
We are especially excited to offer the upcoming campaign story in so many languages. Can't wait!