Add headers to all pages! Also update the look and feel of the test page.

pages/videos.php

@@ -4,5 +4,8 @@
 	Deprecated 2024-03-06 for /media.
 -->
 <?php
+	if (!isset($GLOBALS["HEADER_TITLE"])) {
+		$GLOBALS["HEADER_TITLE"] = "Videos";
+	}
 	include "media.php";
 ?>