I reinstalled the game again. Did everything as usual. But I still get this error with ca.pbo. But in-game it seems to be working fine.
I have subtitles in English, mission briefiengs are also working. At least for the first few missions.
Only pictures in the campaign list are missing. When I click on certain mission, the left side of screen is empty. Anyway, I can live with it.
Thank you for responses. And sorry for my English by the way.
edit: Oh, and the Patching process went fine. I also have the Czech version, not the German one.