Shorten titles in Pholio

Summary: Shortens the titles to 24 characters. Will likely make the boards bigger than 240px at some point.

Test Plan: Tested normal phrases as well as MMMMMMMms. M's will break, but only slightly. Felt it was a fair tradeoff?

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2660

Differential Revision: https://secure.phabricator.com/D5215