Participants with 'can create motions' and 'can manage motion metadata' can't create motions with other submitters

[bspekker]

Describe the bug
Currently participants with 'can create motions' and 'can manage motion metadata' permissions (and not 'can manage motions') can only create motions without adding other submitters.

How to Reproduce
Steps to reproduce the behavior:

1. in settings > motions activate 'Enable text-based submitter in motion creation'
2. give a participants the permissions 'can create motions' and 'can manage motion metadata'
3. log in as that participant
4. create a motion
5. add any submitter from the dropdown menu or additonal user
6. trying to save will results in this error: You are not allowed to perform action motion.create. Forbidden fields: submitter_ids or You are not allowed to perform action motion.create. Forbidden fields: additional_submitter

Expected behavior
while creating motion:

Scenario 1: participant with 'can create motions' and 'can manage motion metadata', NOT 'can see participants' permissions can:

• dropdown for submitters is not visible
• if 'Enable text-based submitter in motion creation' is enabled:
  • instead of the dropdown there should be a H3 text: 'Submitters'
  • it is possible to add additional submitters

Scenaio 2: participant with 'can create motions', 'can manage motion metadata', and 'can see participants' permissions can:

• dropdown menu with submitters is visible
• it is possible to add additional submitters (if setting is enabled)

As stated in #4464:
Please also update the helptext "Requires permission to manage motions"

[Elblinator]

The backend needs to change the behaviour with the appropriate permissions:
OpenSlides/openslides-backend#2760

[reiterl]

It is not clear, which helptext should be translated.