PHT's for Differential.

Summary:
Went through this last night, I had to remove some static vars, but didn't see that as a huge perf issue.

Lint

Test Plan: Tested numerous differential pages, creating a diff, commenting, editing.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4617

src/applications/differential/controller/DifferentialDiffCreateController.php

@@ -42,33 +42,33 @@ final class DifferentialDiffCreateController extends DifferentialController {
       ->setEncType('multipart/form-data')
       ->setUser($request->getUser())
       ->appendChild(
-        '<p class="aphront-form-instructions">The best way to create a '.
-        "Differential diff is by using $arcanist_link, but you ".
+        '<p class="aphront-form-instructions">'.pht('The best way to create '.
+        'a Differential diff is by using %s, but you '.
         'can also just paste a diff (e.g., from <tt>svn diff</tt> or '.
         '<tt>git diff</tt>) into this box or upload it as a file if you '.
-        'really want.</p>')
+        'really want.', $arcanist_link).'</p>')
       ->appendChild(
         id(new AphrontFormTextAreaControl())
-          ->setLabel('Raw Diff')
+          ->setLabel(pht('Raw Diff'))
           ->setName('diff')
           ->setHeight(AphrontFormTextAreaControl::HEIGHT_VERY_TALL))
       ->appendChild(
         id(new AphrontFormFileControl())
-          ->setLabel('Raw Diff from file')
+          ->setLabel(pht('Raw Diff from file'))
           ->setName('diff-file'))
       ->appendChild(
         id(new AphrontFormSubmitControl())
-          ->setValue("Create Diff \xC2\xBB"));
+          ->setValue(pht("Create Diff \xC2\xBB")));
 
     $panel = new AphrontPanelView();
-    $panel->setHeader('Create New Diff');
+    $panel->setHeader(pht('Create New Diff'));
     $panel->appendChild($form);
     $panel->setWidth(AphrontPanelView::WIDTH_FORM);
 
     return $this->buildStandardPageResponse(
       $panel,
       array(
-        'title' => 'Create Diff',
+        'title' => pht('Create Diff'),
       ));
   }