jQuery-validate error messages in Twitter bootstrap tooltips

At work, we're using the combination of ASP.NET MVC3, jQuery, jQuery-validate, knockout and Twitter Bootstrap on one of our projects. Having postponed looking at the aesthetics of the client-side validation for too long, we eventually found ourselves unsatisfied with the default error labels. Wanting to save on space, we're experimenting with the error messages being shown in a Twitter Bootstrap tooltip. After poking around for some while, I came up with something satisfactory.