Defuse XSS in Calendar
Summary: addDetail() takes HTML because we have links there fairly often. :/ This design is iffy.
Test Plan: Reloaded /calendar/status/, verified no XSS.
Reviewers: btrahan, vrana
Reviewed By: vrana
CC: aran
Maniphest Tasks: T139
Differential Revision: https://secure.phabricator.com/D4074