togc

I just discovered that in Spanish version there is no need for language files if I want to switch to English.

define (‘WPLANG’, ‘en_GB’);
in wp-config file is enough.

Now I wonder if exists some plugin which allows users to change the interface language. For example.
http://mydomain.com?language=en
http://mydomain.com?language=es
http://mydomain.com?language=de

etc.

If not, does it mean that I have to install separate versions of Word Press for each language which I want to use?

Thanks.

pathscollide, thank you for your reply.

Actually I am not looking for such a solution that users can add their domains. I will have some 5 domains, thats all. I need a possibility for users to choose a domain when they sign up.

here you can see what I want:
http://premium.wpmudev.org/project/multi-domains

Now, when WordPress MU is not a separate project anymore, I don’t know if this plugin will work for a regular WordPress installation.