R1:2f0121432251

Restore reply instructions to ApplicationTransaction email

Summary: This "Reply to comment, etc., etc." section got lost along the way at some point. Restore it for transaction mail.

Test Plan: Received mail from Maniphest with reply instructions.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D8700