[xwiki-users] Italian language

Hi everybody, I successfully installed XWiki Enterprise 1.5.1.12494, now I'd like to set it up with the Italian language. I saw that it is possible to make XWiki multilingual, and I successfully translated some documents in both English and Italian... but is it possible to make Italian the default language, so that when users log into XWiki the "whole" site is already in Italian? I hope that there is a way to do that, otherwise I'll have to translate every XWiki page from English to Italian... I hope you can help me, thank you very much in advance Carmelo