Notification for session time out

[MaJoHo]

In our case it happens often that people fill a form and until they finished the session timed out so all the work is gone. It would be nice if they get a notification 5 min before the session expires.

[DavidBlaa]

this sounds like a good idea, but for time reasons we have to postpone it until the next release.

[geofranzi]

72c7ae9

[DavidBlaa]

works