Merge pull request 'OZG-6432 Auslesen des Zertifikats verbessert' (#25) from OZG-6432-Auslesen-der-Metadaten-verbessern into master

Reviewed-on: https://git.ozg-sh.de/ozgcloud-app/nachrichten-manager/pulls/25


Reviewed-by: OZGCloud <ozgcloud@mgm-tp.com>