I have managed to change the note at the top of the registration page by going to admin/users/app_loc.../manageusers.ascx.
I could not find anything in global resources!I am still looking for the user name field title and the heading preferred user information. I will keep looking.I have just tried to change my local settings from US to UK and they dont seemed to have changed. How long does this usualy take? are there any querks with doing this?