We don’t have languages fully supported yet. They exist. but are broken (as you can see). There’s no way in-game to fix it on the released build, but it can be manually fixed pretty easily.
1. Go to: %USERPROFILE%\AppData\LocalLow\Revival\Overload
2. Find the correct *.xprefs file (default.xprefs if you’re using the default pilot)
3. Edit it to change O_LANGUAGE:1:I to O_LANGUAGE:0:I.
Let me know if you need clarifying on any of this. And sorry you hit this. We are talking about releasing a quick patch to fix this shortly, but I”m not 100% on when it will be available (hopefully yet this week).