[Translator] added additional conversion for encodings other than utf-8
[Translation] removed unneeded getter/setter
[Translation] removed an uneeded class property
Merge branch '2.1' into 2.2

* 2.1:
  [HttpFoundation][BrowserKit] fixed path when converting a cookie to a string
  [BrowserKit] removed dead code
  [HttpFoundation] fixed empty domain= in Cookie::__toString()
  fixed detection of secure cookies received over https
  [Translation] removed an uneeded class property
  [Translation] removed unneeded getter/setter
  [Translator] added additional conversion for encodings other than utf-8
  fix a DI circular reference recognition bug
  [HttpFoundation] fixed the creation of sub-requests under some circumstances for IIS
[Translation] fixed a unit test