Simplify some transaction translations

Summary: Ref T8700, I don't believe we need to be specific here about the object, since it displays on the object.

Test Plan: Change policy a few times on a task, see new translation

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T8700

Differential Revision: https://secure.phabricator.com/D13913