French translation is terrible since 3.7.1. Use to be almost correct in 3.6.x.

ex:
"Creer un problème" means create troubles... was "soumettre une demande" in 3.6 whise was much better.

... a lot of translations just mean nothing : ex : "Travail du journal terminé",

In order to provide worl load, the text says : "Exemples : 4j, 5h 30m, 60m et 3s.)", but you have to put 4d (4j doesn't work)!
...

This kind of translation make JIRA appears as a poor software in front of compagny decision makers... you should better keep things in english if you can't have a professional french translator instead of using "google translate".