WEBSITE: How was this website built?

This website is the third version of an ever-growing, ever-improving effort to make a useful and customer-friendly webshop for our products.
The current version is based on Drupal 6.x and Ubercart 2.x .
We are largely depending on the efforts of several volunteers in the drupal-community for the very complex techniques that are involved for supporting multiple languages and internationalisation.