Sign up form: Country misidentified as username

[achilleas-k]

The Country field in the sign up form is misidentified as the username by browsers (notably Firefox, #58) when saving credentials. Additionally, when navigating to the sign-up form with credentials are already stored in the browser, the browser offers to autofill the Country field with the stored username (tested in Chrome).

This needs more testing (and maybe some reading of autofill specs?) but it's possibly due to browsers using the last text field before the password as the username.