Make Project slug/hashtag transactions render a little more nicely

Summary: Ref T12732. Use renderValue() to build renderValueList() so we get nice fancy text for these.

Test Plan: {F4967410}

Reviewers: chad, amckinley

Reviewed By: amckinley

Maniphest Tasks: T12732

Differential Revision: https://secure.phabricator.com/D17966