F-grade security status and various errors on website..

See: https://webcookies.org/cookies/zadarma.com/18840648
Re: https://retire.insecurity.today/#!/scan/c4434cce0d265c999924cef78ff4a21041ce22990c5c49411732a2a75781ee86 OK
Re: https://webhint.io/scanner/9af3f89a-616d-4213-9820-2c3c592a97ab
Re: https://observatory.mozilla.org/analyze/zadarma.com
Re: https://securityheaders.com/?q=https%3A%2F%2Fzadarma.com%2Fen%2F

polonus