Add menu_enabled_for: the page can be shown even if there's no link in the menu

app/views/admin/pages/_form.html.erb

@@ -33,6 +33,14 @@
 	<%= f.label :is_published, "#{t('admin.is_published')} ?" %>
 	<%= f.radio_button :is_published, true %>Yes <%= f.radio_button :is_published, false %> No
 </p>
+<p>
+	<%= f.label :menu_enabled_for, "#{t('admin.menu_enabled_for')}:" %>
+	<% @site_valid_locales.each do |valid_locale| %>
+		<%= check_box_tag 'page[menu_enabled_for][]', valid_locale, (@item.menu_enabled_for.nil? ? true : @item.menu_enabled_for.include?(valid_locale)) %>
+		<%= I18nVariable.from_locale(valid_locale) %>
+	<% end %>
+	<%= hidden_field_tag 'page[menu_enabled_for][]', '' %>
+</p>
 <p>
 	<%= f.label :enabled_for, "#{t('admin.enabled_for')}:" %>
 	<% @site_valid_locales.each do |valid_locale| %>