Translateable URL

Hi guys! What is the best way to build translateable URL? 

I could use this way (by routing):

Code:

//english
$route['en/article/(:any)'] = 'artice/view/$1';

//romanian
$route['ro/articol/(:any)'] = 'artice/view/$1';

But if I my website is set to english, I still can acces the link from romanian, so i need to check if the URL correspond to lang set, otherwise to show 404. I also want to keep my texts language in one place (languages folder), not to make them in routes.php