Mark some strings for translation

Summary: Add some more `pht`izations.

Test Plan: Eyeball it.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: hach-que, Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D13200

src/applications/diffusion/controller/DiffusionRepositoryEditHostingController.php

@@ -181,7 +181,7 @@ final class DiffusionRepositoryEditHostingController
           '%s: This repository is hosted elsewhere, so Phabricator can not '.
           'perform writes. This mode will act like "Read Only" for '.
           'repositories hosted elsewhere.',
-          phutil_tag('strong', array(), 'WARNING')),
+          phutil_tag('strong', array(), pht('WARNING'))),
       );
     }