Correctly handle browser's multiple language preference

At log-in and password reset, the user is nicely presented with the preferred language in his browser. This is really a great feature, but when I configure in my browser multiple preferred languages, for instance Spanish, Dutch and German in that order of priority, then log-in should appear in Dutch (because Spanish is not available yet), instead it default to English. English should only be chosen as default, when in order, none of the preferred languages match the available translations. This is just a minor issue, because many will understand English fine, but may be you could change the logic for those that don't and make us multilinguals even more happy.