[i18n] French translation update

[Yannick SEBASTIA]

Hello,

I forward the work of these following translators.

Ronan SALMON for IMP 5.0.3 :  
http://public.ecole-navale.fr/~yannick.sebastia/horde/imp.po

Laurent Foucher for mnemo 3.0, nag 3.0.1 and turba 3.0.2 :
-  http://public.ecole-navale.fr/~yannick.sebastia/horde/mnemo.po
-  http://public.ecole-navale.fr/~yannick.sebastia/horde/nag.po
-  http://public.ecole-navale.fr/~yannick.sebastia/horde/turba.po

Thanks to them.

Regards

Yannick