web sites stats NAN with special characters
it seems as if ISPConfig has some problems with special characters like ä,ö,ü because they are encoded in HTML-Entities (ä ö ...). Domains with special chars should encoded into IDNs to select the correct hostnames from database, which are already IDNs. If the original hostname is taken, there is no record found, which results in NAN at the frontend.
First we should convert every domain via html_entity_decode and after idn_encode. So I created a patch for this, maybe a merge is possible?