// include the default language file for the admin interface
if ( file_exists( "../language/" . $xoopsConfig['language'] . "/admin.php" ) ) {
include "../language/" . $xoopsConfig['language'] . "/admin.php";
}
elseif ( file_exists( "../language/english/admin.php" ) ) {
include "../language/english/admin.php";
Which should do the trick.
Do you have something like
include '../../../include/cp_header.php';
at the start of your admin pages? .