Update strings.xml

Smart radio: option to ignore mode switching while keyguard is locked
Smart Radio: added option for delaying network mode change
Power tweaks: added option for battery charged sound
Pie Controls: implemented long-press support for pie buttons
Key Actions: added Take screenshot action
Key Actions: added action for showing volume panel
LED: option to set pulse notification delay
Added setting to change the tap vs long-press modes of clearing recent activities
Lockscreen: added option for custom carrier text
ModPowerMenu: more clear title for Allow reboot on lockscreen
ModPowerMenu: option to disable power menu on lockscreen
ModViewConfig: extended option for overflow menu button
Lockscreen blur: option to specify blur effect intensity
Merge pull request #435 from ch-vox/patch-29

Updated French translation [JB]