Angular likes to santize and escape all the things, this will help when you really need your api responses compiled as HTML

compileHtml.js

var app = app || {};
app.directive( 'compileHtml', ['$compile', '$sce',
  function($compile, $sce) {
    return {
      scope: true,
      link: function ( scope, element, attrs ) {
        var el;
        attrs.$observe( 'template', function ( tpl ) {
          if ( angular.isDefined( tpl ) ) {
            el = $sce.trustAsHtml(tpl);
            element.html("");
            element.append( el.toString() );
          }
        });
      }
    };
  }
]);

usage: <span compile-html template="{{editorial.content}}"></span>