It's no longer pink, but now I can't start a new game or load an existing one. It's stuck on the loading screen for minutes without anything happening. I attached links to the required files.
Last edit: Seems like steam did a terrible mashup with my game's data. I reinstalled it, repaired it and repaired it again. Second repair finally did the trick and it seems like I'm able to play again.
abaris's post in The whole menu goes pink after I installed White March 2 was marked as the answer