Fix an exception in Ponder comment saving.

Summary:
Add a `setViewer()` so that PHID loading doesn't throw.

Also remove a period from a button because none of the others have one.

Test Plan: Saved a comment successfully.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4202

src/applications/ponder/controller/PonderCommentSaveController.php

@@ -18,6 +18,7 @@ final class PonderCommentSaveController extends PonderController {
 
     $target = $request->getStr('target');
     $objects = id(new PhabricatorObjectHandleData(array($target)))
+      ->setViewer($user)
       ->loadHandles();
     if (!$objects) {
       return new Aphront404Response();