German: Translation for AlarmClock Icon hiding

Patch set 1 - Translation for strings added with
              http://review.cyanogenmod.org/#/c/25163
              removed some whitspace

Patch set 2 - Changed wording according to Matthias Büchner's proposal
Patch set 3 - Fixed typo

Change-Id: I039f333fd5f6af910f8b785072431bc50333a0df