Thanks for the report! I think I've already fixed that for the next version. Meanwhile, please open fr/fr.cfg and go to line 36:
remove-character-button-warning=AVERTISSEMENT: Votre personnage actuel est devenu non sélectionnable.\n
Si vous modifiez votre apparence, vous ne pourrez pas utiliser votre personnage actuel (__1__) à moins qu'il ne soit à nouveau activé par un autre mod !\n (Si vous modifiez votre personnage, tous les inventaires et paramètres seront enregistrés et restaurés, une fois __1__ redevient disponible.)
At the end of the line "remove-character-button-warning=", there is a line break after "\n". That's why, the game expects a new key in the line "Si vous modifiez …", but as there is no "=" after the first world, the game crashes. So just remove the line break and you should be able to load the game again!
While you're at it, you should also go over the other lines. Some of the keys won't work because of spaces in the wrong place. For example, in line 8 there is
minime_character-selector = Activer le sélecteur de caractères
It should be
minime_character-selector=Activer le sélecteur de caractères
So, you'd need to remove all spaces before and after the "=" to prevent messages that there is an unknown key.
This has also been fixed for 0.22, but I can't say when I'll get it ready for upload (working on Water Turrets again, and got side-tracked by helping out the author of Fire Department QuickFix), so I've to look at what still needs to be done for Minime. It's better I finish that before getting side-tracked again. Too many mods to take care of, sorry. :-)