Make Fund backers render a little more nicely

Summary: Ref T5835. Mostly UI smoothing. Also add a "Risks" field to initiatives.

Test Plan: {F214952}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5835

Differential Revision: https://secure.phabricator.com/D10660