Fix dead column link and provide more milestone UI context
Summary:
Fixes T10287. Ref T10286.
- Link stuff properly.
- Generally, show "Parent (Milestone)" instead of "Milestone".
- This probably doesn't get 100% of getName() -> getDisplayName() swaps, but we can get those as we catch them.
Test Plan: See T10286. Also clicked stuff.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10286, T10287
Differential Revision: https://secure.phabricator.com/D15189