Allow hostname in SPF wizard

interface/web/dns/dns_spf_edit.php

interface/web/dns/dns_txt_edit.php

interface/web/dns/form/dns_spf.tform.php

interface/web/dns/lib/lang/ar_dns_spf.lng

interface/web/dns/lib/lang/bg_dns_spf.lng

interface/web/dns/lib/lang/br_dns_spf.lng

interface/web/dns/lib/lang/ca_dns_spf.lng

interface/web/dns/lib/lang/cz_dns_spf.lng

interface/web/dns/lib/lang/de_dns_spf.lng

interface/web/dns/lib/lang/dk_dns_spf.lng

interface/web/dns/lib/lang/el_dns_spf.lng

interface/web/dns/lib/lang/en_dns_spf.lng

interface/web/dns/lib/lang/es_dns_spf.lng

interface/web/dns/lib/lang/fi_dns_spf.lng

interface/web/dns/lib/lang/fr_dns_spf.lng

interface/web/dns/lib/lang/hr_dns_spf.lng

interface/web/dns/lib/lang/hu_dns_spf.lng

interface/web/dns/lib/lang/id_dns_spf.lng

interface/web/dns/lib/lang/it_dns_spf.lng

interface/web/dns/lib/lang/ja_dns_spf.lng