Settings: Update German translation

Ptach Set 1-2:   * removes periods at the end of summaries
                 * fix some translation

Patch Set 3:     * add missing translations
                   http://review.cyanogenmod.org/#/c/29829/

Patch Set 4-6:   * add missing translation
                   http://review.cyanogenmod.org/#/c/28530/
                 * rename some strings

Patch Set 7-10:  * unify translations
                 * rename a lot of strings
                 * rename some arrays
                 * some cleanup

Patch Set 11:    * add missing translations
                   http://review.cyanogenmod.org/#/c/29983/

Patch Set 12-14: * rename some strings
                 * unify 'Display-Sperre' and 'Bildschirmsperre'
                   to fit Google Support guides (http://goo.gl/Z442V)
                 * replace "..." with unicode (…)

Patch Set 15-16: * rename some strings
                 * fix formatting of 'arrays.xml'
                 * replace '…' with '\u2026' to fit AOSP style
                 * use 'Akku' instead of 'Batterie' to keep consistence
                   to AOSP translations

Patch Set 17:    * rename 'Akkuladung' to 'Akkustand'

Change-Id: I7d07353a66c7596421003440036a58f1de72ec05