Question : How can i set another language as default language.

Answer :

Please follow the instructions below

1. Go to admin panel > system > site setting
2. Set default site language to your desired one.
3. Now modify ROOT/application/config/routes.php file
4. Change the following lines

   				$route['default_controller'] = "en/show";
   				$route['404_override'] 	= "en/show/memento404";
   				

   to

   				$route['default_controller'] = "YOUR_LANG/show";
   				$route['404_override'] 	= "YOUR_LANG/show/memento404";
   				

5. Save that file.