Is there a way to change the game language ingame or in the config?
Like V3nom said, it's very easy to change the subtitle language in the in-game options menu, just go to Options -> Audio -> Subtitles. Changing this setting also changes the language in the menu.
Since I saw you were from Germany, I went to check and the game does support German, so you should be good to go (it actually supports a lot of languages, which is always nice).
In fact, I had to change my language to English, because the game detected my OS language and was set to Portuguese by default, so maybe this will happen for you, as well.