Made modals full width by adding .container class. 
Restored label styling (right border) that illustrates the form type hierarchies better.
Added image source model and license model plus according types.
Fix in DTABaseController. The getter is by convention a PHP column name or any other string that gives, if prefixed with 'get' a valid method name on the entity.
Added basic security by a login system that currently takes the user information from a config file (app/config/security.yml)
Connected the security system to the user entities stored in the database.