I am able to customise the Account form and the Contact form on these there is an address field that when the user clicks on it, there is a popup shown to the right. I want to be able to customise this popup as it uses American address terminology and I've been asked to change that. (All of our addresses are UK based and always will be).
I'm attaching a screenshot to demonstrate what popup I mean.
All I need to know is where in system customisation I can find that popup form. ie: where in the customisation tree is it and what's it called?