Fix missing csrf_cookie_name in the cms toolbar

There was an issue with reordering plugins in the cms toolbar: 
 "Uncaught ReferenceError: csrf_cookie_name is not defined" was raised.
The cms.base.js needs csrf_cookie_name variable but it was not in the scope.
Merge pull request #3243 from MagicSolutions/support/2.4.x

Fix missing csrf_cookie_name in the cms toolbar