Hi Georg,
Sorry to hear it isn’t working.
All of our translations are provided by the community and the German translation is typically 100% complete for both plugins: there was a glitch in the release before our most recent one, though, where some broken language files were included.
With that in mind, can you ensure you’ve updated to our very most recent builds (The Events Calendar 4.5.7 and Events Calendar PRO 4.4.13) and see if that resolves any of the problems?
Beyond that, to submit fixes or add translations that are currently missing, you can use the following links:
A great overview of translations in the context of our plugins can be found in the following knowledgebase article:
theeventscalendar.com/knowledgebase/translating-the-events-calendar
Let me know if you need further help or guidance 🙂