Address dynamic class property deprecation warnings

templates/AlbumHeaderBox.php

@@ -8,6 +8,11 @@
 
 class AlbumHeaderBox extends SubTemplate
 {
+	private $back_link_title;
+	private $back_link;
+	private $description;
+	private $title;
+
 	public function __construct($title, $description, $back_link, $back_link_title)
 	{
 		$this->title = $title;