Corine here’s an answer from @callmevlad but it’s from lst year and I don’t know how much it’s still true:
http://forum.webflow.com/t/two-domain-names-one-site/2494
Now I think it’s legitimate to want one domain per language.
@bart, could you clear that topic for us? What is possible? I think the website Corine wants a double domain on is a CMS one.