Translate German comments, fix some ws

There were a lot of spurious \t's in the code.
I replaced them with a space.

Change-Id: I12b3207f0e4d217fb5d4e406e7b16a0d29f3bcaf
Reviewed-on: https://gerrit.libreoffice.org/9831
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>