Clean up of WebProfiler Controller classes:

Added missing "@throws" PHPdoc comments in controllers
Updated deprecated reference to Symfony\Component\HttpKernel\Debug\ExceptionHandler to use Symfony\Component\Debug\ExceptionHandler instead
Merge branch '2.3'

* 2.3:
  Fixed English usage for existing users.
  Clean up of WebProfiler Controller classes:
  [Process] Fix #9343 : revert file handle usage on Windows platform