404 for pages and asset column error

app/controllers/pages_controller.rb

@@ -10,6 +10,7 @@ class PagesController < ApplicationController
   end
   
   def show  
+    begin  
       item = Item.first(:conditions => {:full_name => params[:page_name]})
       case item._type
         when 'Page'
@@ -18,7 +19,9 @@ class PagesController < ApplicationController
         when 'Link'
           redirect_to "http://#{item[:url]}"
       end
-        
+    rescue
+      render :file => "#{Rails.root}/public/404.html", :status => :not_found
+    end
   end
   
 end

app/views/admin/assets/index.html.erb

@@ -12,7 +12,7 @@
       <th><%= t('admin.description') %></th>
       <th><%= t('admin.format') %></th>
       <th><%= t('admin.orig_upload_file') %></th>
-      <th><%= t('admin.file_name') %></th>
+      <th><%= t('admin.file_size') %></th>
       <th><%= t('admin.action') %></th>
   </tr>
 

config/locales/en.yml

@@ -48,7 +48,7 @@ en:
     editing_user_attribute: Editing user attribute
     enable_language: Enable language
     file_name: Filename
-    filr_size: File size
+    file_size: File size
     format: Format
     is_published: Is published
     item: Item