$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
switch ($lang){
    case "fr":
        //echo "PAGE FR";
        include("en/index.php");
        break;    
    case "en":
        //echo "PAGE EN";
        include("en/index.php");
        break;        
    case "de":
        //echo "PAGE EN";
        include("en/index.php");
        break;        
    default:
        //echo Default";
        include("en/index.php");
        break;
}
?>