[TYPO3] basic problem with multiple languages

[Stanislas Hodur]

Hello,
I need to create a multilingual site (say: de, en, es, fr, pl, ru) and 
I would like to do it in typo3.

Having unzipped typo3 v. 4.1 src+dummy and installed via 1-2-3, I 
switch to back-end and try to create the languages: page|new|website 
language. There, according to the tutorials, I am supposed to choose 
the (1) language name, (2) flag and (3) ISO code.

The problem is: I have _no_ ISO Code field. Why?

Trying to create languages without ISO code is useless -- cannot see 
the translated pages.

If I start with the Christmas-tutorial version (the one from Casper 
podcast), the ISO Code field is present, though there are some other 
problems with TemplaVoila, so I cannot use it anyway...

I am not good enough to compare christmas vs. dummy versions to see 
the difference.

What do I miss or what should I do? Please, help!

--
staho

(windows XP home, wamp5 1.6.6, php 5.2.0, apache 2.0.59, mysql 5.0.27)