title: Add another custom interpolator in Angularjs
body: <p>I still want <code>{{1+2}}</code> to be evaluated as normal. But in addition to the normal interpolator, I want to create a custom one that I can program to do whatever I want. </p>
  
  <p>e.g. <code>&lt;p&gt;[[welcome_message]]&lt;/p&gt;</code> should be a shortcut for <code>&lt;p&gt;{{'welcome_message' | translate}}&lt;/p&gt;</code>, or <code>&lt;p translate="welcome_message"&gt;&lt;/p&gt;</code>. That way, i18n apps would be much more convenient to write.</p>
  
  <p>Is anything like that possible? I'm currently going through the angular.js source code, but the interpolation system looks pretty complicated(?). Any suggestions?</p>