Herald - print out rule monogram rather than rule phid on transcript controller

Summary: Fixes T4632.

Test Plan: viewed a transcript for rule x which depends on rule y and noted "rule y" printed out rather than "PHID-BLAH-BLAH"

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4632

Differential Revision: https://secure.phabricator.com/D8678