Multilingual application

Hi,
I am trying to find out how to make the web multilingual.
Can you tell me please, what is the best practice?

I have routes like this:

Code:

$route['((en|cz)/)?test'] = 'test/index';

Is there a way to write it better?

In MY_controller I do this:

PHP Code:

public $language = 'sk'; // should not be protected??? But I can not call it in template if it is protected
protected $languages = ['en', 'cz'];

public function __construct()
{
    parent::__construct();

    if( in_array( $s1 = $this->uri->segment( 1 ), $this->languages ) ) $this->language = $s1;
} 


Is it the right way to use?

Thanks.