What is this hacker language?

While doing some experiments with the Google Logo, i landed up in the URL
http://www.google.com/intl/en_ALL/images/logo.gif

And then, tried checking if the directory listing was enabled( I was quite sure that it is not but just for a bit of self -satisfaction) I tried this URL, http://www.google.com/intl/
but this resulted in showing up a page not found message. The interesting part was that it suggested me a URL

www.google.com/intl/ja/

Now, i tried using the search syntax,
intl site:www.google.com/intl/

And my curiosity grew after seeing the word hacker in the URL http://www.google.com/intl/xx-hacker/

This is something interesting.
Learnt that there is a language called a hacker language.
1. Why would Google host such a page?
2. Does anyone use that site?
3. Is there something special about this Hacker Language?
4. Or is this some sort of SEO technique(instead of just showing a page not found exception, also suggesting another URL) to retain users?