AcceptLanguage is a String property that indicates the languages preferred in a HTTP response. AcceptLanguage can contain the same valid values as the ContentLanguage property. 

Each language specified may have an associated quality value which represents an estimate of the user preference for the languages specified by that range. The quality value defaults to "q=1". For

  da, en-gb;q=0.8, en;q=0.7

The special character "*" matches every tag not matched by any other language specifier in AcceptLanguage. If no AcceptLanguage header is present in the request, the server assumes that all languages are equally acceptable.

TIdEntityHeaderInfo.ContentLanguage