phtize all the things

Summary: `pht`ize a whole bunch of strings in rP.

Test Plan: Intense eyeballing.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: hach-que, Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12797

src/applications/diffusion/controller/DiffusionPathValidateController.php

@@ -58,7 +58,7 @@ final class DiffusionPathValidateController extends DiffusionController {
       if ($branch) {
         $message = pht('Not found in %s', $branch);
       } else {
-        $message = pht('Not found at HEAD');
+        $message = pht('Not found at %s', 'HEAD');
       }
     } else {
       $message = pht('OK');