multisite multilingual over different directory
I was solved this problem . May be use to you for only Multisite

Solution: 

Give Symbolic link form mulitsite to site1
Executed that command line 
ln -s /var/www/multisite /var/www/site1

Rename example.sites.php to sites.php
// 192.168.1.99 local IP address
$sites['192.168.1.99.site1'] = 'site1';

put this line in sites.php 


No need to use RewriteBase /xx 

If you have any problem in symbolic link use this link https://superuser.com/questions/68685/chown-is-not-changing-symbolic-link

and also How do I setup multiple sites with one database in Drupal 7 (or) Multisite Apache configuration with Drupal