Merge branch '3.4' into 4.2

* 3.4:
  fix translation domain
  tag the FileType service as a form type
  [Validator] Fix GroupSequenceProvider annotation
  Update ajax security cheat sheet link
  Fix AuthenticationException::getToken typehint

JsonResponse.php

@@ -18,7 +18,7 @@
  * object. It is however recommended that you do return an object as it
  * protects yourself against XSSI and JSON-JavaScript Hijacking.
  *
- * @see https://www.owasp.org/index.php/OWASP_AJAX_Security_Guidelines#Always_return_JSON_with_an_Object_on_the_outside
+ * @see https://github.com/OWASP/CheatSheetSeries/blob/master/cheatsheets/AJAX_Security_Cheat_Sheet.md#always-return-json-with-an-object-on-the-outside
  *
  * @author Igor Wiedler <igor@wiedler.ch>
  */