Send intro text with SmartForward

* We need to include the intro text (--Original Message--, etc.) to
  SmartForwards, and somehow this got in a past updat
* Add unit test for forwarding
* Fix unit test for reply so that it works localized

Bug: 2477988
Bug: 2685784
Change-Id: I8d92f00d37a434840ec3eb237f3901cd5dc7ad09
2 files changed