add renderValue() in transactions
Summary: fix T11290.
Test Plan: Paste language type, view in web and in emails (It uses quotes in HTML emails, which I think is something else).
Reviewers: epriestley, chad, #blessed_reviewers
Reviewed By: chad, #blessed_reviewers
Subscribers: Korvin
Maniphest Tasks: T11290
Differential Revision: https://secure.phabricator.com/D16252