PIM-1298 : add group label translations
PIM-1298 : add create action in group controller
PIM-1298 : change controller declaration
PIM-1298 : add group type
PIM-1298 : add group handler
PIM-1298 : declare group form type
PIM-1298 : declare group handler
PIM-1298 : add group form
PIM-1298 : add group classes as parameters
PIM-1298 : add group create view