po: update German translation
Several translated strings were splitted into smaller ones. The older
translation either is a duplicate of the new one or does not apply
anymore.
Reviewed-By: Christian Heimes <cheimes@redhat.com>
(cherry picked from commit 117893f03e4f26044e7b15053e336b8d42b4f180)
Reviewed-By: Christian Heimes <cheimes@redhat.com>