edit display names of list members / delete list members

As list members are not django users, there is no way to edit the display names of list members. In some scenarios, it is useful to be able to edit these names (like: Parent of XXX) to give list admins a better overview while they centrally manage subscriptions.

This could either happen in the users/members/subscription options in the list view, or within the django admin panel (here would be the place to completely delete these data if users request them to be deleted following their right to be forgotten.)