R1:c9be5fef2783

Show spaces in policy explanation dialogs

Summary: Ref T8449. When an object is in a space, explain that clearly in the policy description dialog.

Test Plan: {F496126}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T8449

Differential Revision: https://secure.phabricator.com/D13264