admin: Add status label for all models in details

Add a colored badge in the details of every model that has a status
field. This colored badge has four different colors:

* Green, to indicate success,
* Orange, to raise a warning,
* Red, to indicate failure or deletions,
* Blue, for everything else

Fix apyrgio/synnefo#222
Merge branch 'feature-admin-details-status' into feature-admin