Translate German comments

Remove some left over German comments with their translation
underneath. Also, correct some Denglish and typos.

Change-Id: I3c321dd1030695ca4443447a852e81dec9383aed
Reviewed-on: https://gerrit.libreoffice.org/7885
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>