diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 96b2e510..9c77fe48 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -26,7 +26,7 @@ class ApplicationController < ActionController::Base
 
   def deny_access
     session[:return_to] = request.original_url
-    redirect_to login_url, :alert => 'Access denied!'
+    redirect_to login_url, :alert => I18n.t('application.controller.error_denied')
   end
 
   private
@@ -37,7 +37,7 @@ class ApplicationController < ActionController::Base
       # No user at all: redirect to login page.
       session[:user_id] = nil
       session[:return_to] = request.original_url
-      redirect_to login_url, :alert => 'Authentication required!'
+      redirect_to login_url, :alert => I18n.t('application.controller.error_authn')
     else
       # We have an authenticated user, now check role...
       # Roles gets the user through his memberships.
@@ -83,7 +83,7 @@ class ApplicationController < ActionController::Base
   def authenticate_membership_or_admin
     @group = Group.find(params[:id])
     unless @group.member?(@current_user) or @current_user.role_admin?
-      redirect_to root_path, alert: "Diese Aktion ist nur für Mitglieder der Gruppe erlaubt!"
+      redirect_to root_path, alert: I18n.t('application.controller.error_members_only')
     end
   end
 
diff --git a/config/locales/de.yml b/config/locales/de.yml
index d46ea8d3..f562bf87 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -212,6 +212,11 @@ de:
       workgroups:
         members: Mitglieder
         name: Name
+  application:
+    controller:
+      error_denied:
+      error_authn:
+      error_members_only: 'Diese Aktion ist nur für Mitglieder der Gruppe erlaubt!'
   article_categories:
     create:
       notice: Die Kategorie wurde gespeichert
diff --git a/config/locales/en.yml b/config/locales/en.yml
index bdb867c3..e42480e3 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -212,6 +212,11 @@ en:
       workgroups:
         members: members
         name: name
+  application:
+    controller:
+      error_denied: 'Access denied!'
+      error_authn: 'Authentication required!'
+      error_members_only: 'This action is only available to members of the group!'
   article_categories:
     create:
       notice: Category was stored