Problem with special characters in URL

[ylefebvre]

When validating URLs, some special characters that are accepted by browsers are not accepted by the form validator. For example, the link: http://idrætshistorie.dk/ works perfectly fine in Chrome and Firefox, but is seen as an invalid link by the form validator.

Of course, when you type this address in a browser or click on a link with this special character, it ends up somehow getting converted to display as http://www.idraetshistorie.dk/, but it still a valid URL that can be linked to, so I feel like Form Validator should also accept it.