Updates in DNS manager

interface/lib/classes/plugin_listview.inc.php

interface/lib/classes/tform.inc.php

interface/lib/classes/tform_actions.inc.php

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

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

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

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

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

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

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

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

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

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

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