I've downloaded the englich installer for linux, and its in german now (german is my system language). Where do i set the languege? I cant find the setting in the game.

I make a mistake perhaps but in Gog Galaxy, one be able to choose the language of game (finally this been just like that for me)

You can also add LANG=en. I don't know how it is done in windows , but for Linux it works, just start the game with:

LANG=en ./start.sh

or change the start script "start.sh". In front of "run_game" add "LANG=en" as such:

default() {
LANG=en run_game
}

LANG changes the systemlanguage for the command after it.

You may use symbolic links to trick the system. As my system is in French, there's no voices. I just made a link from English.hpk to French.hpk.
You could also copy the files and rename them.