User display name

[BigFlagBurito]

Is your feature request related to a problem? Please describe. Hi, the user has name as primary key. This means that the name cannot represent the user name, because it can happen that there are several identical user names. This is why the e-mail is used in my case. Furthermore, jupyter-collaboration is used. For this reason, the name is the group name. It is difficult for an instructor to recognise exactly which users are meant by the email, id or group name in the UI.

Describe the solution you'd like It would be good if the user has an additional attribute display_name. This can then be set by the post_auth_hook, for example, and is then displayed in all UI elements instead of name.