Oh, OK, my understanding was that you want to send people with
uselang=fr but located in Romania to wikilovesmonuments.fr, which
doesn't make a lot of sense.
Still, your idea doesn't scale well without changes to the server
configuration, which I'm not sure is possible on all the websites
(e,g, Spain will need to have /es, /en, /cat and possibly /fr, /pt
etc.). I think that as long as the pages in other languages are
visibly linked from the main page, we're ok with redirecting to the
main page of the site.
Strainu
A local site without such parameters could be configured with an url
without the magic $LANG bit.
Regards