[i18n] [Horde-Head] Updated fr_FR.po.

[Thierry Thomas]

Hello,

Updated fr_FR.po:
- <http://pompo.net/horde/fr_FR.po>
- just a diff: <http://pompo.net/horde/fr_FR.po.diff>.

Note: it includes remarks from Serge Grondin <SGrondin at csbf.qc.ca>.
-- 
Th. Thomas.