Fixes in structure editor:
 - row selection
 - add margins between rows to enable to drop an element
Handle failed payments in PaymentReturn block.
Homogenize buttons in workflow actions.
Add missing labelKey in some routes.
Merge pull request #850 from intportg/dev

Misc fixes (structure editor, routes, etc)
Merge pull request #851 from inthause/documents

Update 'rbs-document-select' admin directive
Add send mail action on success and failed payment transaction
Mail is now activable
Merge pull request #852 from renaudJennyRBS/mail

Other send mail actions on transaction
Update admin breadcrumb service