Adds IDN suport (closes #19)

CHANGELOG

locale/de_DE.utf-8/LC_MESSAGES/edentata.po

locale/en_US.utf-8/LC_MESSAGES/edentata.po

src/class/Utils.php

src/module/dns/CustomCreate.php

src/module/dns/CustomDetails.php

src/module/dns/Overview.php

src/module/dns/RegisteredDetails.php

src/module/dns/ServiceDetails.php