R1:7e9a2dc4d25b

Clarify "Closed" revision status with VCS-specific language

Summary: Instead of rendering "Revision Status: Closed (Sat, Apr 28, 10:28 AM)", render "Revision Status: Closed (Pushed Sat, Apr 28, 10:28 AM)", or "Committed", as appropriate.

Test Plan: Looked at a committed revision.

Reviewers: btrahan, vrana, jungejason

Reviewed By: jungejason

CC: jeffmo, rdbayer, aran

Maniphest Tasks: T909

Differential Revision: https://secure.phabricator.com/D2334