Thanks for answering my question. I wish I was told this, I wouldn't have bought the game probably.
I use several languages and need to practice them, all this crap with not letting me choose free each app and game's language is annoying.
Is it possible to use the Windows version with Portal Kit or something like that?
Yes, certainly. You can use Wine/Wineskin and run the Windows version under it instead. It will take some more CPU but in general it should work fine. And as you probably know, language selection is very easy on it...it's in the options. The general game experience itself is actually better on the original Windows version anyway (unfortunately but not surprisingly).