Laravel 4 multilanguage site

filters.php

App::before(function($request)
{
	// default browser language
	$language = substr($request->server->get('HTTP_ACCEPT_LANGUAGE'), 0, 2);

	// language set from route
	if (null !== $request->segment(1)) {
		$routeLanguage = $request->segment(1);

		if (! in_array($routeLanguage, Config::get('site.languages'))) {
			return Redirect::to('en');
		}
	} else {
		return Redirect::to('en');
	}
});

routes.php

// default browser language
$language = substr(Request::server('HTTP_ACCEPT_LANGUAGE'), 0, 2);

// language set from route
if (null !== Request::segment(1)) {
	$locale = Request::segment(1);

	if (in_array($locale, Config::get('site.languages'))) {
		$language = $locale;
	}
}

// set the language
Config::set('app.locale', $language);
App::setLocale($language);

Route::group(array('prefix' => $locale), function()
{
	Route::get('/', array('as' => 'homepage', 'uses' => 'HomeController@index'));

	Route::group(array('before' => 'auth'), function()
	{
		Route::get('dashboard', array('as' => 'user.dashboard', 'uses' => 'UserController@dashboard'));
	});

	Route::group(array('prefix' => 'admin'), function()
	{
		Route::get('/', array('as' => 'admin.dashboard', 'uses' => 'admin\DashboardController@index'));
	});

	Route::when('*/admin/*', 'admin.auth');
});