Now fix the actual local problem

app/assets/javascripts/user/app/routes/application_route.js.coffee.erb

@@ -45,9 +45,9 @@ App.ApplicationRoute = Ember.Route.extend
       message = null
       if error.status is 404
         if klass.routeName is 'table'
-          message = t('errors.status404.model.message', model: t("models.#{klass.routeName}"), id: transition.state.params.table.table_id)
+          message = t('errors.404.model.message', model: t("models.#{klass.routeName}"), id: transition.state.params.table.table_id)
         else
-          message = t('errors.status404.general.message')
+          message = t('errors.404.general.message')
       @transitionTo('index').then (route)->
         route.get('controller.controllers.application').set 'notice', message
 

config/locales/user.en.yml

@@ -95,7 +95,7 @@ en:
         title: There is a problem with the application
         body: Please try to restart
     errors:
-      status404:
+      404:
         model:
           message: Cannot find %{model} with id %{id}
         general:

config/locales/user.nl.yml

@@ -94,8 +94,8 @@ nl:
         body: Herstart de applicatie om het op te lossen
 
     errors:
-      status404:
+      404:
         model:
-          message: %{model} met id %{id} kan niet worden gevonden
+          message: '%{model} met id %{id} kan niet worden gevonden'
         general:
           message: Data niet beschikbaar