Merge pull request 'OZG-6990 FileManager: Dateiinhalt ersetzen' (#6) from OZG-6810-FileManager-Dateiinhalt-ersetzen into master

Reviewed-on: https://git.ozg-sh.de/ozgcloud-app/document-manager/pulls/6


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