Allow transactions to be grouped in the TimelineView

Summary: TimelineView on Maniphest is often kind of hard to parse because related/simultaneous transactions aren't visually grouped. Allow grouping. I'm going to clean this up a little bit more.

Test Plan: See screenshot.

Reviewers: chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D7107
Improve feed stories for Maniphest and some more translations

Summary: Ref T2217. Render feed stories like "alincoln updated T123" instead of "alincoln updated this task.". Fix up some more translations.

Test Plan: Looked at feed, saw something a bit more reasonable.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2217

Differential Revision: https://secure.phabricator.com/D7108
Update priority icons for Maniphest

Summary: Adds a normal icon, uses raised and lowered.

Test Plan: update a task

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D7109
Enrich "gave a token" feed story

Summary: Name the token which was given in the feed story.

Test Plan: Gave/rescinded tokens. Looked at a feed story.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7110