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At the time of writing only english and swedish is supported. But more langages will be supported in upcoming releases. 

On failed SSO login

If the SSO request fails one of the following HTTP status codes will be returned. 

Response: 302 - Found

If the SSO request is valid the HTTP status code 302 Found is returned with the Meridix authentication cookies set. The response also contains a Location header causing browsers to redirect to the logged in users startpage.
http://en.wikipedia.org/wiki/HTTP_302 

Response: 403 - Forbidden

The HTTP status code 403 Forbidden will be returned with an additonal status message descripting why the request was denied. An example of a reason can be Nonce already consumed that is returned if the nonce/token used for the signature already have been consumed during the timstamps allowed interval.
In additon to the standard response status message a response header with the key API.403_reason is added with the same response.
http://en.wikipedia.org/wiki/HTTP_403 

Response: 400 - Bad request

The HTTP status code 400 Bad request will be returned if the request was in an invalid format if for example the request has missing query strings. A status description message is also added describing the reason for the 400 code.
In additon to the standard response status message a response header with the key API.400_reason is added with the same response.
http://en.wikipedia.org/wiki/HTTP_400