R1:aa5df5fb0786

Convert Nuance Sources to EditEngine

Summary: Ref T10537. Converts sources to EditEngine.

Test Plan:
- Created a new source.
- Edited an existing source.
- Submitted a complaint with the complaint form.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10537

Differential Revision: https://secure.phabricator.com/D15434