ぶっちゃけ日本語は入ってない
コミュニティでのQandAでも開発者が入ってないって言ってたし

Q: Will the game be localized in different languages?

A: Yes, here is the list of available languages.
Interface & Subtitles: French, English, Italian, German, Spanish (Spain), Czech, Polish, Portuguese (Brazil). Russian, Simplified Chinese, and Spanish (South America).
Audio: French, English and German