Translate German comments and fix a few missed one

Change-Id: Ieb5798a98453d0a6b0e368f7444150c758a9c7ac
Reviewed-on: https://gerrit.libreoffice.org/7753
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>