Do I have to have language in URL? [Codeigniter]

codeigniter seo multilingual

you could add some lines to your route config and to your core to do what you want.

Here are two links with a lot of information to implement this: http://codeigniter.com/wiki/URI_Language_Identifier/

http://sumonbd.wordpress.com/2009/09/16/develop-multilingual-site-using-codeigniter-i18n-library/