Back to /#/URL for an easier development

Discard the removal of the /#/ prefix for URL to make the development
easier :

By removing this prefix, it forces to go back to root of the app to
refresh a view which has juste been modified : B-O-R-I-N-G ...

But later, we will remove again this prefix to have cleaner URLs
Views Improvement : no apps message + panel color for delete and update panel page
Views : Add a Modal for deletion approval
Correct bad highlighting for tooltip of modal
Add default image in Apps List