Changing default text

Squarespace Commerce is new to me, and I really want to make it work, but the default English language on the product page and chart is a deal-breaker. Consumer service confirmed there is currently no way of changing this through settings or site style, but suggested there might be a way with custom CSS.

I have trouble changing the name of "chart" (top right when still bowling products), as well as the word "select" in the dropdown menu on complex product variants. Is there anyone here with more experience that could help me figure out these customizations?
 

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@paul2009 thanks for the tips. 

I am using the Pacific template, and my problems concern the commerce pages (products and chart). More specifically: the drop-down menu for product variants, and the "chart" button in the top-right corner that appears when a product is put in chart and costumer continues shopping. 

www.dystergaard.no/butikk

OK, I understand now that I see your Norwegian site.

You can usually change the 'Cart' title but when a customer leaves the cart they will be taken to an English language checkout. Is this not a larger concern?