Renaming a user group is not reflected when the group is a member of a circle #1828

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Steps to reproduce

1. Create a user group group-test.
2. Add the user group to a circle.
3. Rename the user group to group-renamed.
4. Open the membership modal again.

Observe that the group is still listed with the former name group-test.

Expected behaviour

The new name should be used in Circles.

Actual behaviour

The initial user group name is used everywhere which is confusing.

Server configuration

Nextcloud version: master (as of today)

See also #1296
The linked PR is not valid anymore as it changes a service that is not existing any longer (MembersService.php).