How do I change....

How do I change the text "sign in" and "Become a member" in the position topnav?
I want to translate the text to norwegian, the same goes for the popups!
Where do I do this? Can someone point me in the right direction please?

The best place to start is by looking at the gk_language file in siteroot/language/en_GB/en-GB.tpl_gk_templatename.ini there maybe a better way to override languages in J1.6 and 1.7 using the new system.

This strings should be included in template file so please look at en-GB.tpl_gk_boutique.ini file.