Does that mean you can't properly play at all OO since you can't load files?
That...sucks

I know it can't be a definitive solution but maybe switch the game to English until they patch it?
I can if I manually rename the save files.
I can confirm that many other people in the french BG3 community have the same issue.
The wierd characters in the "suggested" savegame file name are the cause of the problem.