French translations for 2.3.

This is the squashed result of work done by Thibaut Cuvelier
and Jonathan Courtois from developpez.com and myself (barely).

Full history is available on the team's repository:
http://qt.gitorious.org/+developpez-dot-com/qt-creator/qt-creator-fr



Change-Id: Ia9317f894f2df7096cc6a9c39093b417d0a2ba35
Merge-request: 370
Reviewed-by: Pierre Rossi <pierre.rossi@nokia.com>
Reviewed-on: http://codereview.qt.nokia.com/3056


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>