French Final Update (For now)

This is the final french update until new strings are added to the original file.

I fixed grammatical faults, the gallery line fault and i improved the names of certain features that sounded weird in French. All that is now fixed and cleaned.

PS: I've sent the .xml file in a XDA message to you and west. It's exactly the same changes that i've done here so no need to do it twice.
Merge pull request #8 from Madikan/patch-2

French Final Update (For now)