Added missing italian lang files

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

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

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

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

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

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

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

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

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

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

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

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

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

interface/web/mail/it.lng

interface/web/mail/it_mail_alias.lng

interface/web/mail/it_mail_alias_list.lng

interface/web/mail/it_mail_blacklist.lng

interface/web/mail/it_mail_blacklist_list.lng

interface/web/mail/it_mail_content_filter.lng

interface/web/mail/it_mail_content_filter_list.lng