GuestOk you did this - but did you think of miniBB upgrades in the future? Now if we release the new version, you either will not have any easy chance to upgrade at all, either will have to re-update all of your files again.
Your case is a bit more difficult than explained in this thread. You really need to have 2 different table chains to store different forums in them, but the same users table. Then for each forum, you preferably should have a different sub domain, which still would point to the same forum core files. When a Slovenian or English sub domain is chosen, there should be a code which selects the proper table set for this forum.
In setup_options.php the code would be like this:
if(Slovenian forum is chosen){
$Tf='forums_slovenian';
$Tt='topics_slovenian';
$Tp='posts_slovenian';
}
elseif(English forum is chosen){
$Tf='forums_english';
$Tt='topics_english';
$Tp='posts_english';
}
I.e. the script will load up different tables for different language. No cookies, no other alterations to database or scripts are required.
This implementation requires experience and your creativity :-) Multiple forums from multiple sub domains may run on the same, not altered core of miniBB. That's the main concept. I hope you've got some basics of the idea.