R1:248d79f36d19

Fix "Actions" button on Phame standalone/live pages (bonus: JX.sprintf())

Summary:
See <https://discourse.phabricator-community.org/t/non-functional-actions-menu-on-live-phame-views/2593>. Several layers here:

The "Actions" button is broken because a menu behavior is failing, since we aren't rendering the menu.

When a behavior fails to initialize, catch and log the exception and continue. Previously, we stopped initializing behaviors if any failed, but behaviors are usually independent and continuing…