Translation to German and consitent date/time

I would gladly contribute to the German translation. Also, there are some inconsistent translation strings and the zoom integration is automatically in English. So all the buttons in the meeting itself are in English. Is there any kind of code or hook that I can change so the Zoom frontend will be shown in German? Additionally, even I added German strings for “days, hours, minutes, seconds” in the backend, the registration countdown still shows the English abbrevations. So a lot of ToDos there. How can I contribute with the translations?