Go to the Translatewiki.net homepage, and register as a new user.
After pressing the Create account button there will be a small duration when nothing happens. This is because an AJAX call is done to create the user and we are not showing a loading symbol.
Since this is one of the first interactions that translators will have with our software, maybe a good idea to display a loading symbol to avoid the user having to wonder whats going on after pressing Create account.