Hello!
Thank you very much for your time. You would not have typed in this comment had not the game attracted you :)
I bet you have already followed such a step-by-step tutorial, but just in case you haven't:
https://support.microsoft.com/en-us/help/14236/windows-language-packs
Unfortunately this game was developped when we were all students at ISART DIGITAL, and we cannot modify the uploaded build. Although we agree with you on a KeyBinding option in the menu, nothing can be done!
Cheers!