Word replacement not working in some areas
Word replacement for County works on the demo - I renamed it to County/rename.

http://joomla.demo.civicrm.org/administrator/?option=com_civicrm&amp;task=civicrm/contact/add&amp;reset=1&amp;ct=Individual

State/Province is a default field, I'm not sure why you're not using that, instead of renaming. Look at your address settings, link on demo: http://joomla.demo.civicrm.org/administrator/?option=com_civicrm&amp;task=civicrm/admin/setting/preferences/address&amp;reset=1