few tweaks + remove accents function

inc/toolbox.php

@@ -380,7 +380,7 @@ class ToolBox
 	 * @param String $string
 	 * @return String
 	 */
-	public function remove_accents($string)
+	public static function remove_accents($string)
 	{
 		if(!preg_match('/[\x80-\xff]/', $string)) return $string;