WordPress and WooCommerce already have Swedish translations, you should probably use them.
GTranslate is a “Javascript hack” that would push every ready-made page of your site through machine translation. Machine translation may give a decent result, but it will never get as good as the human translations that are already available.
So here’s the way to go:
1. Under Settings → General select “Svenska”.
2. Make sure that your theme has a Swedish translation. You’re welcome to suggest strings to the community if needed.
3. WooCommerce already has a Swedish translation which is relatively well maintained by its vendor, Automattic. But check if you’ve got any additional plugin that still needs translation (especially if the plugin outputs any strings on the front end of your site).
Here’s a document that tells you much more about how we translate WordPress to Swedish: https://wpsv.se/engagera-dig/stilguide-for-oversattningar/
If you’ve got any further questions specifically around “making things in Swedish”, feel free to post in our Swedish support forum at https://sv.www.ads-software.com/support/