update translations

[ThomasWaldmann]

This is likely an evergreen issue (will never be closed), but just to have a pointer here for people wanting to help:

The docs building workflow (which includes updating the translations) is documented there, please read:

https://multigeiger.readthedocs.io/en/latest/development.html#building-the-docs-with-sphinx

For now, we want to restrict languages to German and English only - please no requests for new languages yet.

We want to restrict, because there is quite a lot changing yet:

• some stuff is not available in English yet, we should have ALL in English and move to English as original language in the future.
• some docs need improvements (this changes original strings and requires re-translation)

Thus, multiplying this work to more languages is not advisable now or in near future.

Links to current docs:

• https://multigeiger.readthedocs.io/en/latest/
• https://multigeiger.readthedocs.io/de/latest/