Remove useless roles from roles.txt

Description

While writing the documentation for role-based visibility, I have realised that there are quite a number of user interface roles made available to the user that are completely useless.

The goal of this task is to remove those roles so that users don't get confused by being presented roles that have no effect when being selected.

Fixed and reviewed
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Assignee

Sven Stauber

Reporter

Sven Stauber