internationalization i18n without segment (mandatory)

I have created a new portal in 5 language using the library: internationalization i18n

https://github.com/bcit-ci/CodeIgniter/w...ation-i18n

Works fine, but the in the url there is ever the language segment (en, fr, de, ru ecc)
example: www.site.it/it/ www.site.it/en/

I would like call my homepage without the segment; How can I do?

Thanks!