Rename .js.es6 to .js in the admin application

app/assets/javascripts/admin/controllers/admin.js

@@ -0,0 +1,41 @@
+import discourseComputed from "discourse-common/utils/decorators";
+import { inject as service } from "@ember/service";
+import Controller from "@ember/controller";
+import { dasherize } from "@ember/string";
+
+export default Controller.extend({
+  router: service(),
+
+  @discourseComputed("siteSettings.enable_group_directory")
+  showGroups(enableGroupDirectory) {
+    return !enableGroupDirectory;
+  },
+
+  @discourseComputed("siteSettings.enable_badges")
+  showBadges(enableBadges) {
+    return this.currentUser.get("admin") && enableBadges;
+  },
+
+  @discourseComputed("router._router.currentPath")
+  adminContentsClassName(currentPath) {
+    let cssClasses = currentPath
+      .split(".")
+      .filter(segment => {
+        return (
+          segment !== "index" &&
+          segment !== "loading" &&
+          segment !== "show" &&
+          segment !== "admin"
+        );
+      })
+      .map(dasherize)
+      .join(" ");
+
+    // this is done to avoid breaking css customizations
+    if (cssClasses.includes("dashboard")) {
+      cssClasses = `${cssClasses} dashboard-next`;
+    }
+
+    return cssClasses;
+  }
+});