404 on Prestashop 1.5 under nginx

[tonimarmol]

I have a problem with nginx giving a 404 error on a Prestashop 1.5.4.1
site.

This is the URL returning the 404:
www.domain.com/es/index.php?controller=order-confirmation

The prestashop is under multilanguage enviroment. Then I have:

www.domain.com/en/
www.domain.com/es/
www.domain.com/fr/
www.domain.com/de/
The URL rewriting runs fine, except when the url have the "index.php". Then
nginx returns de 404.

I think the problem is on nginx virtualhost configuration, but I don't know
what it's failing.

My nginx configuration: http://pastebin.com/CFQ5hwNX

That nginx configuration runs perfect on a Prestashop with only 1 domain
(without the /lang/ on the url).

Nginx version: 1.4.0

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,239630,239630#msg-239630