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

app/assets/javascripts/admin/helpers/post-action-title.js

@@ -0,0 +1,16 @@
+import Helper from "@ember/component/helper";
+
+function postActionTitle([id, nameKey]) {
+  let title = I18n.t(`admin.flags.short_names.${nameKey}`, {
+    defaultValue: null
+  });
+
+  // TODO: We can remove this once other translations have been updated
+  if (!title) {
+    return I18n.t(`admin.flags.summary.action_type_${id}`, { count: 1 });
+  }
+
+  return title;
+}
+
+export default Helper.helper(postActionTitle);