Formatting event dates in list view

Summary: Closes T8639, Formatting event dates in list view

Test Plan: List view should show dates in wide and narrow lists.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T8639

Differential Revision: https://secure.phabricator.com/D13398