The AllmessagesDeluxe gadget on French Wikipedia loads, but when you click on “Appliquer” at Special:Allmessages, it throws a JavaScript error:
ReferenceError: AllmessagesDeluxe_CheckPanel is not defined
This is probably due to the scope changes introduced by ResourceLoader.
Gadget code: https://fr.wikipedia.org/wiki/MediaWiki:Gadget-AllmessagesDeluxe.js