The web api supports localized informational messages. This means that messages like broken rules or errors can be returned in a language of the users choosing. The requested culture should be given in the form of: language[-territory]. See Wikipedia - Locale.

There are two ways to indicate in which language the web api should return messages.

When the request header and the query string parameter are both set, the query string parameter will take precedence. The default culture of the web api is Dutch. When no culture is specified via a request header or query parameter all messages will be returned in Dutch. Date formats are not localized by the web api, they are always returned in the dutch format (dd-mm-yyyy).