R1:8fc45e1774a6

Diffusion - further fix translation of revert commit stories

Summary: didn't quite get there in D12309

Test Plan: made a revert commit and inspected my feed and it was correct (screenshot shortly)

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12333