I can help with russian translation. Current version looks creepy Also, it would be much better if you will change the font Is it enough to edit lang file on github?
Yeah the language files on github are all the game takes.
For font though, our game requires *.TTF font which uses UTF-8 encoding. If you want to change the font, you will need to find such a TTF font which supports Russian language. You can change the fonts on github too.