How to change Commerce dafault text?

Site URL: https://tarpon-earthworm-rxc5.squarespace.com/shop

I would like to make Squarespace Commerce, but I have a problem. The defaut text in product page select - quantity - add to basket - etc. -  and all in the texts in chart are in english. Is there anyone who can help me with that. Is it better to just change the provider or can this be made in Squarespace with custom code?

Is there any articles about this, or can you help me? You can also give me your offer for your help. 

The link is for a page I just have been playing around so you can see it (password is shop). I haven't really made it because this important question needs to be solved before.
This is older version, but I can also start totally new site with newer version, if it helps🙂

Presumably for Finnish?

This can be done with varying levels of success, but you’ll have an issue when you reach the checkout. The checkout contains fixed text that cannot be changed within Squarespace, even with code.

If you are prepared to purchase a third party translation tool, then you could use Squarespace for commerce. If not, you would be better choosing another platform. See a similar post here: 

Thank you for your reply, I will take a look!