Show the customized "Login" message on the login screen
Summary: Depends on D19992. Ref T13222. If administrators provide a custom login message, show it on the login screen.
Test Plan:
- Viewed login screen with and without a custom message.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13222
Differential Revision: https://secure.phabricator.com/D19994