Code improvements

app/assets/javascripts/dispatcher.js

@@ -482,13 +482,15 @@ import Activities from './activities';
           break;
         case 'groups:labels:new':
         case 'groups:labels:edit':
+          new Labels();
+          break;
         case 'projects:labels:new':
           import('./pages/projects/labels/new')
             .then(callDefault)
             .catch(fail);
           break;
         case 'projects:labels:edit':
-          import('./pages/projects/labels/new')
+          import('./pages/projects/labels/edit')
             .then(callDefault)
             .catch(fail);
           break;

app/assets/javascripts/pages/projects/labels/edit/index.js

 import Labels from '~/labels';
 
-export default function () {
-  new Labels(); // eslint-disable-line no-new
-}
+export default () => new Labels();

app/assets/javascripts/pages/projects/labels/index/index.js

-/* eslint-disable no-new */
 import LabelManager from '~/label_manager';
 import GroupLabelSubscription from '~/group_label_subscription';
 import ProjectLabelSubscription from '~/project_label_subscription';
 
 export default () => {
   if ($('.prioritized-labels').length) {
-    new LabelManager();
+    new LabelManager(); // eslint-disable-line no-new
   }
   $('.label-subscription').each((i, el) => {
     const $el = $(el);
 
     if ($el.find('.dropdown-group-label').length) {
-      new GroupLabelSubscription($el);
+      new GroupLabelSubscription($el); // eslint-disable-line no-new
     } else {
-      new ProjectLabelSubscription($el);
+      new ProjectLabelSubscription($el); // eslint-disable-line no-new
     }
   });
 };

app/assets/javascripts/pages/projects/labels/new/index.js

 import Labels from '~/labels';
 
-export default function () {
-  new Labels(); // eslint-disable-line no-new
-}
+export default () => new Labels();