Update system.php
Update system.php

is_ipaddr + error reword
NewEraCracker/pfsense,dennypage/pfsense,phil-davis/pfsense,dennypage/pfsense,dennypage/pfsense,pfsense/pfsense,phil-davis/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,NewEraCracker/pfsense,pfsense/pfsense,dennypage/pfsense,phil-davis/pfsense,pfsense/pfsense,pfsense/pfsense,NewEraCracker/pfsense