Convert AphrontFormControl to safe HTML

Summary: Everything here now should properly handle plain strings and safe HTML.

Test Plan: /settings/panel/display/

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4826

src/applications/paste/controller/PhabricatorPasteEditController.php

@@ -164,10 +164,9 @@ final class PhabricatorPasteEditController extends PhabricatorPasteController {
         ->appendChild(
           id(new AphrontFormMarkupControl())
           ->setLabel('Text')
-          ->setValue(
-            'Paste text can not be edited. '.
-            $fork_link.' to create a new paste.'
-          ));
+          ->setValue(hsprintf(
+            'Paste text can not be edited. %s to create a new paste.',
+            $fork_link)));
     }
 
     $submit = new AphrontFormSubmitControl();