clarify purpose of Minimum field (negative cache TTL)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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