Update French translations for 2.3.4

[ccordoba12]

@SylvainCorlay or @Nodd, could you help me with this one? As always, please remember to do the PR against the 2.3 branch.

This is going to be the last release of the 2.3 branch. I was hoping 2.3.3 to be the last one, but we needed this release to fix a couple of issues with Jedi, and some bugs that I had had in my todo list for a long time :-)

[ccordoba12]

Hey guys, I really need your help here. Only three sentences need to be updated, so the amount of work is very small.

I need to release this ASAP because of the new Anaconda release that's going to happen really soon ;-)

[SylvainCorlay]

No worries. I will do this real quick.

[ccordoba12]

Thanks man! Really appreciate it!