R1:fd8d9ff0d689

Replace some hsprintf() with phutil_tag() and phutil_tag_div() Depends on D7545.

Test Plan: This is one of the rare moments where unit tests for views would be useful.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7547