French translation - Adding missing strings

Change-Id: Ic9c8ddffdb914e389b188a7c9d67ba732060c447
czech translation
Add kitkat settings icon.

* Thanks to Lo Huot.

PS1: Match sync transparency with new settings one (low it a bit for those on top bar).
PS2: Use more native Google icons, from Google apps (need to check how looks size, they seam smaller).
PS3: Resized icons, seems fine now

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: Idbeee85fda2a575a56217d7da11ade65673301c7