Settings: French translation
Sources :
https://android.googlesource.com/platform/packages/apps/Settings.git/+/master/res/values-fr/arrays.xml)
Reboot menu option (from DU-4.4.4)
Apply DU strings new guidelines : renammed du_strings.xml an du_arrays.xml

Change-Id: Iabb6cbc449d22c2052f362222613603fda2ef8c9