fix js bugs

app/controllers/application_controller.rb

@@ -128,7 +128,7 @@ class ApplicationController < ActionController::Base
   def authentication_failed
     respond_to do |fmt|
       fmt.html do
-        render :text => "authentication failed", :status => 401
+        render :plain => "authentication failed", :status => 401
       end
 
       fmt.xml do

app/controllers/legacy_controller.rb

@@ -44,7 +44,7 @@ class LegacyController < ApplicationController
   end
 
   def unavailable
-    render :text => "this resource is no longer available", :status => 410
+    render :plain => "this resource is no longer available", :status => 410
   end
 
 private

app/controllers/static_controller.rb

@@ -9,7 +9,7 @@ class StaticController < ApplicationController
   end
 
   def not_found
-    render text: "not found", status: :not_found
+    render plain: "not found", status: :not_found
   end
 
   def error