Problem with changing the language

According to the howto (found under http://forums.buyscripts.in/frequent...-language.html), I tried to change the language, but there seems to be a problem with that.

To check out which $_Session['LANG'] is passed to the templates, I created a new smarty assign in admin/index.php like this:

$smarty->assign('language', $_SESSION['LANG']);

and echoed it out in index.tpl with {$language}.

As far as I could see, the session should set the current language folder, in my case 'de', since I have changed $language = 'de'; in the config.php

But no matter what I do, the session allways says 'en'. By digging deeper into that, I found the following code in class.language.php:

PHP Code:

---

 $allowedLaguages = array(
            'en', 'fr'
        ); 


---

I tried to add 'de' to this array, but still no luck.

Sure, a workaround could be to simply rename my 'de' folder to 'en' on the server, but that is not the point. Does anybody have an Idea about that? Any help with that is gladly appreciated.