Admin interface: filtering zencoder jobs by failed state
Improve error handling, add tests
Add tests for media set highlights, cover and content display mode
ui: implement new action bar for Entries and Sets
simpler login_action, move to top navigation
resources: actions menu: move up 'organize'
resources: actions menu: adressen without 'verwalten'
fixing tests

(also some real bugs)
Add export access for guests