Click on the cloud icon to upload your ZIP archive, fill in the other fields as you need, and press save.
if you leave it as it is, our server will try to match the language of the guest's browser with the available translations in the archive. You can force the language by adding "lang=language" at the end of the URL. You should replace the "language" part with the language you wish to link to like so:
Feel free now to link to it in your portal with a tag, embed it with an iframe or make an AJAX call to retrieve the HTML.