3
If you are squeamish about modifing the core to do this you could probably modify the theme.html file to load a different stylesheet based on the <{$xoops_langcode}> smarty variable
<{if $xoops_langcode eq. 'en'}>
<!-- Load English Stylesheet -->
<{elseif $xoops_langcode eq. 'it'}>
<!-- Load Italian Stylesheet -->
<{/if}>
you can determine what a language's langcode is by looking at /language/<language>/global.php
//%%%%% LANGUAGE SPECIFIC SETTINGS %%%%%
define('_CHARSET', 'ISO-8859-1');
define('_LANGCODE', 'it');
