Display hint about who to contact for quota changes

[jcfischer]

When a user needs an increased quota, it would be nice if there's a way to display a contact address, where she can apply for a larger quota.

Depending on the setup, this could be implemented in a variety of ways:

• Just display one EMail address or message ("Please contact your friendly admin at xyz@example.org)
• ask a backend for the admin address to display (In the SWITCH case, our own AdminUI knows who the admin of a given project is) -> define a REST API
• add a link to the AdminUI where a request can be made directly by the end user