Refactor all calls of p::clean() to SafeString::of() and p::purify() to SafeString::purify().

Removing any p::clean() calls for arguments to t() and t2() since their args are wrapped in a SafeString anyway.

modules/gallery/views/permissions_form.html.php

@@ -6,7 +6,7 @@
     <tr>
       <th> </th>
       <? foreach ($groups as $group): ?>
-      <th> <?= p::clean($group->name) ?> </th>
+      <th> <?= SafeString::of($group->name) ?> </th>
       <? endforeach ?>
     </tr>