Language based on Geolocation

That's not something that HikaShop should handle.

If you use JoomFish on your website for multilingual support, there is actually a geoloc plugin to do that:
www.joomfish.net/en/the-club/87-gold-benefits

Note that the language used by default when you access the website is the language of the browser. If the browser of the user is in dutch but that the user lives in china, the website will display in dutch and not in chinese. If the browser of the user is in dutch, there is a high chance that the user reads dutch regardless of where he lives...
I suggest that you keep it the way it is.