- Added missing error messages in language files.

interface/web/client/form/client.tform.php

interface/web/client/lib/lang/en_client.lng

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

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

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

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

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

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

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

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

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

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

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

interface/web/mail/lib/lang/en_mail_content_filter.lng

interface/web/mail/lib/lang/en_mail_user_stats_list.lng

interface/web/sites/form/web_subdomain.tform.php

interface/web/sites/lib/lang/en_ftp_user.lng

interface/web/sites/lib/lang/en_shell_user.lng

interface/web/sites/lib/lang/en_web_aliasdomain_list.lng

interface/web/sites/lib/lang/en_web_domain.lng