Replaced "retreive" with "retrieve".

src/Umbraco.Web.UI.Client/src/views/content/content.edit.controller.js

@@ -132,7 +132,7 @@ function ContentEditController($scope, $routeParams, $q, $timeout, $window, appS
             // from the server so that we can load in the actions menu.
             umbRequestHelper.resourcePromise(
                 $http.get(content.treeNodeUrl),
-                'Failed to retreive data for child node ' + content.id).then(function(node) {
+                'Failed to retrieve data for child node ' + content.id).then(function(node) {
                     $scope.currentNode = node;
                 });
         }