Calculator: Update German translation

Patch Set 1:    * initial release

Patch Set 2-3:  * rename strings after comments

Patch Set 4:    * use unicode
                * remove [WIP] tag

Patch Set 5:    * rebase

Change-Id: I809bf126f708012c36cb7946ccd1b7f24b9cf8e7
Merge "Calculator: Update German translation" into cm-10.1