title: Display negative currency with parentheses in Angular 2 / Typescript
body: <p>Angular's en-us localization has been updated since 1.3 to display negative currency with a negative sign instead of parentheses. I am using AngularJS 2 / Typescript and would like to override the default negative sign with parentheses (or even something else).  </p>
  
  <p><a href="https://github.com/angular/angular.js/issues/12870" rel="noreferrer" title="github angular issue">Discussion</a> on this shows to override negPre &amp; negSuf however I do not see how to do this with Angular2.  Or maybe a more elegant way to achieve this.</p>