Added client limits to the DNS module.

interface/web/client/client_edit.php

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

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

interface/web/client/templates/client_edit_limits.htm

interface/web/dns/dns_a_edit.php

interface/web/dns/dns_alias_edit.php

interface/web/dns/dns_cname_edit.php

interface/web/dns/dns_hinfo_edit.php

interface/web/dns/dns_mx_edit.php

interface/web/dns/dns_ns_edit.php

interface/web/dns/dns_ptr_edit.php

interface/web/dns/dns_rp_edit.php

interface/web/dns/dns_soa_edit.php

interface/web/dns/dns_srv_edit.php

interface/web/dns/dns_txt_edit.php

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

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

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

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

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