CRUDController now uses a new API to set the session flash message.
It also allows you to set multiple flash messages for the same type of message.
Merge pull request #1256 from imenem/new-style-flash-messages

CRUDController now uses a new API to set the session flash message.
Fix tab id issue with non valid character
Added new configuration parameter in "templates" for "list__batch.html.twig" tempalte.
updated documentation
Added new configuration parameter in "templates" for batch_confirmation
Fix typo
FIX: Someone mixed up russian translations for title_edit and link_action_edit keys
Fix #o1265
Merge branch '2.1'
fix breadcrumbs generation
Fix tab on modal window
Fix layout for modal popup
Improve short description preview
Select form first tab with errors on load / submit