fixed request format when forwarding a request
Merge branch '2.2' into 2.3

* 2.2:
  fixed request format when forwarding a request
  [HttpKernel] added a comment to warn about possible inconsistencies
  added a functional test for locale handling in sub-requests
  Fixed issue #6932 - Inconsistent locale handling in subrequests
  fixed locale of sub-requests when explicitely set by the developer (refs #8821)

Conflicts:
	src/Symfony/Component/HttpKernel/Tests/Fragment/InlineFragmentRendererTest.php