v0.99.5.1: Supplier certificate upload and German publish messages

Suppliers can upload certificates on their own, and the GS1 prefix publish messages are available in German.

Supplier certificate upload

Suppliers can upload certificates to their Certificates page without an open data request, so they can keep their evidence library up to date and link certificates to later data requests.

Publish messages in German

Publish check messages for GS1 prefixes are available in German.