Howto: wp e-commerce qtranslate categories
the best way of making your WP e-Commerce solution to be multilingual is to use qTranslate plugin.
but some of the functions are not implemented by qTranslate. For example, localization of Products categories.
In this case you need to add some code to qtranslate_hooks.php file. It is located in the root of your qTranslate plugin.
// WPSC Taxonomies
That’s it. Now you are able to translate your products categories to your languages.
solution is found here.