language error in joomla 3 in Hikashop

I did a try to to install a module who translated my site to multiple languages. But now there is english system messages in Hikashop and it used to be Norwegian before i innstalled the module Gtranslate. I need help to set all back to norwegian so it does not say: add to cart when viewing products but this text: legg i handlekurv. But there are more places where the English takes over. I need help asap because this a website of my client!!!