How to set up WPLANG in wp-config.php for 4 languages?

I just found this which I applied and works perfectly:

If you have your blogs installed in subdirectories you could use this solution:

if (strpos($_SERVER['REQUEST_URI'], '/enblog') === 0) {
    define ('WPLANG', 'en_US');
} else {
    define ('WPLANG', 'pl_PL');
}

… and so on. Good luck!

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