How to change language words and Carrier?

How to change language words and Carrier?

Hi!
Just getting started and I found that some words are translated wrong in the swedish language. "Quote" for examle is "Offert" in swedish not "Citation" as the default translation is. How do I change the translation? 
I realy do want to be able to send Quotes (Offerter) in the swedish language but as it is now nobody will understand what "Citation" means.

My second question is how do I add other carriers than the ones that are in the scroll list? or choose not to have a carrier at all, deliveryterm EXW for example in the quote and order? 
  
Looking forward to start using the software!