Make @topic, @event_type, @bundle fully translatable

This is indeed an unpleasant bug. You can see the effects of this here on the subscriber page in the user profile. In the meantime, we have also used DANSE, which we do with almost every module, to find such errors. We have translated it completely into German on the localisation server.

Once the bug has been solved, the final result should no longer show any English-language strings in the UI if the translation is complete. This is currently not the case. See screenshot.

Is this topic also covered by 📌 Suggested user- and admin-facing interface tweaks Needs work which has progressed a lot?

I don't think so, mainly because I stumbled upon this yesterday late at night. At least I didn't add this over there.

Well, I do think it's at least related. In item 2 of the original post, there is a proposed change like this:

- $this->t('@topic @entity_type of type @bundle', [
+ $this->t('Subscribe to @bundle @entity_type (@topic)', [

See the change in the MR at https://git.drupalcode.org/project/danse/-/merge_requests/13/diffs#46213...

That will at least make the approach here very different. Maybe, after the other one got merged, there is still something to do, but at least we should probably wait for the other one to be completed.