dnsexit: include same IP message in success_regex
ddns.sh: transition to i18n form; requires some changes to ddsn-gargoyle::/etc/ddns_providers.conf + a slighlty intrusive eval in ddns.js because of a /Duplicate/ regex
basic_edit_mac.sh removed due to no longer being used
backup.sh, reboot.sh & update.sh: transition to i18n form