Mms: Fix build warnings

Fix build warnings, introduced by http://review.cyanogenmod.org/#/c/34123/

Dutch translations are covered seperately.

Change-Id: I867e3ff5f6cd2c54a33d2448a622db76379b046e
Mms: Update German translation

Patch Set 1:    * add translation for 'Option to strip
                  all unicode characters from SMS'

Patch Set 2:    * rename string after comments

Patch Set 3-5:  * rebase

Patch Set 6:    * add translation for 'Insert contact info'
                * unify translations

Change-Id: Iace6ae5e75d0d23510252188b568245a60ec185d
merge changes from remotes/github/cm-10.1 into master