Configuration: GC3 v4.1 from Epic.
I tried playing the game. Switched it to French. Here is the horrible result:
Got enough crashs that I could not play the game anymore. Will uninstall it as soon as I post this reply.
Even when switching back to English the savegames come along with their translated interface. What a mess.
Just wanted to make my point here that you'd better not implement a feature than badly implementing it and ruining the experience.
I'd suggest a rollback but I guess there a commercial contracts mentionning "multilanguage support" somewhere in the dark...