[Queue-2.0] Selection/Picking shows "request (not) picked"

In the request events for being not picked and being (not) selected, we might want to address the user rather than the request. This is because the event occurs when the user is not selected for a session, rather than that the request is not selected for something.

The following discussion from !456 (merged) should be addressed:

• @otto started a discussion:

  Student instead of request?