I have installed the WooCommerce Multilingual plugin for a website using WooCommerce 2.0.3 and it doesn't seem to be possible to set it up to use a different slug for the shop pages. The slug definition was removed from the Pages section in the settings and replaced with its own permalink structure definition on the main permalink settings page.
Maybe a solution could be to add a custom rewrite tag, something like %woocommerce_catalog_name%, which would be replaced with the correct slug for the selected language and could be used in the permalink structure definition.
Another problem I'm experiencing, is that when adding the same product to the cart in different languages the products are added as separate entries. I don't know if this is normal behaviour but I do believe that in the back-end, on the order overview the products should be displayed in their default language but they are not.
Will there be an update to support WooCommerce 2.x