R1:42170ab151a9

Change text ADD_CC and REMOVE_CC actions

Summary: Fixes T8559

Test Plan: ran phab locally, saw text changes

Reviewers: lpriestley, #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Maniphest Tasks: T8559

Differential Revision: https://secure.phabricator.com/D13317