Unprototype Spaces
Summary: Ref T8449. Also, fix annoying inconsistency between "Spaces" and "spaces": "Spaces" is the application, the things it creates are just "spaces", similar to how "Maniphest" creates "tasks".
Test Plan: Mostly reading. Viewed /applications/.
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: eadler, epriestley
Maniphest Tasks: T8449
Differential Revision: https://secure.phabricator.com/D13547