* 2.3:
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/EventListener/ExceptionListener.php
src/Symfony/Component/HttpKernel/Fragment/RoutableFragmentRenderer.php
src/Symfony/Component/HttpKernel/Tests/Fragment/RoutableFragmentRendererTest.php
HttpContentRenderer has been renamed to FragmentHandler.
The RendererStrategy subnamespace has been renamed to Fragment.
The strategy classes now have Fragment in their names.
ProxyRouterListener has been renamed to FragmentListener
The router_proxy configuration entry has been renamed to fragments.