Migrate Pholio to Frankenstein transactions

Summary: Begins the process of migrating Pholio to Modular Transactions by starting with the mock's description and changing the base class of PholioTransaction. Expect several more of these diffs to quickly follow. Also changes the icon for description changes to fa-pencil; previously it was check or ban, depending on the open/closed state. Looks like an accidental switch fallthrough.

Test Plan: made new mocks, edited their descriptions, observed same UI as previously

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D17864