Fix missing label in Request Review

Summary: Fixes T3564. This was a change out of FB recently, see D6340. Add a missing label.

Test Plan: "Request Review" now has a label.

Reviewers: chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T3564

Differential Revision: https://secure.phabricator.com/D6484

src/applications/differential/view/DifferentialAddCommentView.php

@@ -63,6 +63,7 @@ final class DifferentialAddCommentView extends AphrontView {
     $enable_ccs = ($action == DifferentialAction::ACTION_ADDCCS);
     $add_reviewers_labels = array(
       'add_reviewers' => pht('Add Reviewers'),
+      'request_review' => pht('Add Reviewers'),
       'resign' => pht('Suggest Reviewers'),
     );