fdo#39468 translate more German comments, etc.

* Translated some more German comments
* Some typos corrected
* Removed useless comment decoration

Change-Id: I40176e23983193e5087f48cf7d7b8e5eb339d6c6
Reviewed-on: https://gerrit.libreoffice.org/7463
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>