German translations missing or wrong

[hbruch]

Currently, many German translations are missing or wrong.

I'm planning to provide a PR contributing PO/JSON files for the de locale. Mimicking the good practice of @audour who reported likewise for the French locale in #16550, this issues report serves as announcement so other contributors do not duplicate efforts (or report if they are already working on the same), like #16550 did for the French locale.

However, before requesting a PR, I have some questions regarding this contribution:

• I planed to work on the master branch, while chore(fr-translation): update whole French translation (based on 1.3.0 release) #16868 is based on 1.3.0 version. What do you prefer?
• chore(fr-translation): update whole French translation (based on 1.3.0 release) #16868 did not include an updated pot file. I did not check yet, but I assume it's up-to-date for 1.3.0.(?). In case I'd submit a PR for master: should it contain the updated pot file and all po/jsonfiles for all locales or just the de locale I'm working on?
• There a couple of messages, which are not localized yet (e.g. View all, Viewed in the CRUD welcome tables, See all in EmptyState.tsx, settings in the MenuRight.tsx. For those, I'd provide a preceding PR, if I base my contributions on master.