codeigniter redirecting to a url - codeigniter

Question

I have a website with a url like so (which works fine)
http://www.page.com/en/controller
But there always have to be a language and a controller in the url otherwise the page doesn't load or there is no language (no text).
Is it possible that when I enter a url like this
http://www.page.com
I get redirected to
http://www.page.com/en/controller
And the controller would be hidden? Only this would be left (my links require first segment to load a page with a particular language)
http://www.page.com/en
p.s tried routing and redirect, but with no luck
Sorry for the late response, I was away.
my routes
$route['default_controller'] = 'arena/display';
$route['(:any)/renginiai'] = "renginiai/getevents";
$route['(:any)/arena'] = "arena/display";
$route['(:any)/paslaugos'] = "paslaugos/displayServices";
$route['(:any)/kontaktai'] = "kontaktai/displayContacts";
$route['(:any)'] = 'pages/view/$1';
$route['404_override'] = '';
$route['translate_uri_dashes'] = FALSE;
My_Controller which is located in core folder. I load my language libraries from here.
/**
*
*/
class MY_Controller extends CI_Controller{
public function __construct()
{
parent::__construct();
$languages = array("lt", "en");
if(in_array($this->uri->segment(1), $languages)){
$this->lang->load($this->uri->segment(1), $this->uri->segment(1));
}
}
}
And this is my front page controller
<?php
class Arena extends MY_Controller{
public function display($year = NULL, $month = NULL){
/*$this->load->model('Mycal_model');*/
$this->load->model('Image_model');
$data['images'] = $this->Image_model->get_image_data();
$this->load->view('includes/head');
$this->load->view('includes/nav', $data);
$this->load->view('includes/header', $data);
//$this->load->view('includes/calendar', $data);
$this->load->view('includes/section');
$this->load->view('includes/footer');
}
}

Answer 1

open application/config/routes.php file and change
$route['default_controller'] = "en/controller";