fdo#39468 translated some german comments

Also translated some exception messages

Change-Id: I92c3b1be125eb384c33257d6c8b7ff8337ce5f2f
Reviewed-on: https://gerrit.libreoffice.org/13481
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>