Fix wrongly translated title in web browser and autopilot-title

[Elblinator]

Describe the bug

1. For some pages The webbrowser title is getting translated (which additionally to just being not the correct behaviour throws an Error in the console)
2. In the autopilot The title of the projected content is translated (

How to Reproduce

1. Create a participant, a motion, an election, a topic with only the title/surname "Participants"
2. Chagne the Openslides language to german
3. Navigate to the detail pages of these contents
4. The Webbrwoser title is "Teilnehmende"
5. Project the motion, election or topic
6. Navigate to the Autopilot
7. The displayed title is "Teilnehmende"

Error for the detail pages

motion-view.component.ts:206 ERROR Error: Parameter "key" is required and cannot be empty
    at _TranslateService.instant (ngx-translate-core.mjs:696:13)
    at _MotionViewComponent.setTitle (base.component.ts:97:49)
    at _MotionViewComponent.onMotionUpdated (motion-view.component.ts:234:15)

Expected behavior

1. The webbrowser title should not be translated on the named detail pages (participant, motion, election, topic)
2. The Autopilot Title should not be translated

[reiterl]

I cannot reproduce the failure. Tested with German meeting, motion, motion w. amendments.

[reiterl]

I cannot reproduce it.
So I looked at the code. I'm not sure why this happen: It seems like the ViewMotion.getTitle() delivers a undefined, null or perhaps empty string. That should not happen, as title is required. Perhaps broken data?

I still needs a way to reproduce this.

[reiterl]

I have seen the error message few times with empty spaces in motion view, but not every time. So, I am not sure why this happens.

[reiterl]

This could also be a problem with the "new" translate service.

[Elblinator]

The problem is not singularity in the motion-detail and a bit conceptual.

The same problem also occurs in topic-detail, assignment-detail, participant-detail. And there is a very similar problem in the autopilot.

I'll update the Issue according to the new findings