Depending on the complexity of the site and if you can use the cms you could make two identical collections. sitename/en and sitename/sv. That works for SEO as well. Or use folders if you can’t use the cms.
Look at Google translation for websites. Not as pretty but it works.
There’s another service called babble you could look at.
Sorry for the late reply. Your website will be hosted on WF? Because I’m not sure if WF let you create subdomains that works with folders like any other hosting. But a path like yoursite.com/en/ and yoursite.com/es/ could work