Start translation of German comments

Change-Id: If936d3f8647cbcd15d42de985ae0351d683d4b44
Reviewed-on: https://gerrit.libreoffice.org/9832
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>