It smashed the work of all of us. That's inevitable to make the transform you have requested. Sorry.
I don't understand the problem: The links "https://userbase.kde.org/index.php?title=Special:Translate&group=page-Krita&language=fr&action=page&filter=" seems to be exactly the same in all three cases. Am I missing something?
Yurchor, would it be possible to revert to the state before your fixes, then saving all the translations, re-doing the fixes and then uploading the translations? It is a pity, that all this work is lost (including my own :-) ).
I think, no. If I revert we will come to the initial point. It is good to solve this problem once and forever (as I remember this mess was created a long time ago and the solution was not found so far). Yes, now it is solved a little be similar to the Alexandrian solution to the Gordian knot, but it is solved. ;)
I will restore yours and other translations manually. Just give me some time.