My next button in the shopping cart says HIKA_NEXT

When finalizing the purchase there is a final button to press and I suppose it is supposed to say NEXT but it says HIKA_NEXT, I use a Swedish translation and would like it to say NÄSTA, I cant find HIKA_NEXT in the translation, in the translation it only says next and is correctly translated. How do I fix this?

I can see the swedish translation in our translation file:
HIKA_NEXT="Uppdatera/nästa"

That means that you don't have updated your language file and thus you don't have the latest translations that we added for each release since you first installed HikaShop.

I've encountered the same problem - after trying to adjust my VAT to GST.

Been trying to load the latest version - not having any luck doing this. It keeps saying its been loaded in my text area. I'm not sure what this means.

Then you need to save it to by clicking on the save button.
If that problem only happened after changing the translation file, it might be because you didn't change the file properly and joomla is not able to process the file anymore.

Which version of joomla are you using ?
With joomla 1.7, there is a debug translation option that you can activate on your joomla configuration which can tell you where the translation file is broken if that's the case.