I see a lot of localization languages in the game files, how can I apply them (change the original English text to French, for example)?
I'm not sure what you mean with game files, but this game has not been translated into any other language than english. I created this game by myself, and I only speak english and german. I might make a german translation at some point, if I have the time, but a translation into any other language would have to be volunteered by somebody else.