Updated French translation [KK]

ModLockscreen: simplify custom background handling (KitKat only)
ModLockscreen: added option for custom background blur effect
QS Tiles: disabling of tile spanning is now optional
Proper title and description for Force music volume control option
Updated French translation [KK]

Minor correction
Updated French translation

better translation
Merge pull request #322 from ch-vox/patch-12

Updated French translation [KK]