Trebuchet : Add french missing translation

Patch set 2 : Add new translation (rebase)
Patch set 3 : Correction
Patch set 4 : Correction
Patch set 5 : Add msgid and correction
Patch set 6 : correction
Patch set 7 : correction
Patch set 8 : add new translation (rebase)
Patch set 9 : correction
Patch set 10 : correction

Change-Id: Ifd940f98806f623b6c4256863ce737c5dfd1e107