Show display name instead of username in the frontend

[q-wertz]

Describe the bug
Currently when hovering over the author colors the username is shown. This is often something cryptic etc.

To Reproduce
Steps to reproduce the behavior:

1. Open a document
2. Activate Show author colors
3. Hover over the edited area
4. The username is shown

Expected behavior
The displayname of the user should be shown instead.

Screenshots

Client details:
Not relevant

Server details

Text app version: 3.3.0

Operating system: Not relevant

Web server: Not relevant

Database: Not relevant

PHP version: Not relevant

Nextcloud version: 22.2.5