As Promised, here is a little tutorial on how to create a blog with multiple languages without using any plugin.
First, you should create a network of blogs using following these instructions : http://codex.wordpress.org/Create_A_Network
Once you have your network set, just create a second / third blog with the proper sub urls. You can now share the same plugins, same wordpress installation, same theme with various languages.
What I usually do is have one main blog just as a placeholder, one with /fr base url and one with /en base url.
I still miss the functions to get links between posts but we could probably find plugins to do that :)
That was easy wasn’t it?
Next time I may talk about exporting zd_multilang content. I made a plugin for that but I still need to make some changes to make it work properly.
Français