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/phpast/controller/PhabricatorXHPASTViewRunController.php

@@ -41,7 +41,7 @@ final class PhabricatorXHPASTViewRunController
           ->setHeight(AphrontFormTextAreaControl::HEIGHT_VERY_TALL))
       ->appendChild(
         id(new AphrontFormSubmitControl())
-          ->setValue('Parse'));
+          ->setValue(pht('Parse')));
 
     $form_box = id(new PHUIObjectBoxView())
       ->setHeaderText(pht('Generate XHP AST'))