[Rails] Devise route for confirmation error with :locale

Rails 3.1.3

I have setup devise and i18n . In routes.rb

scope "/:locale" do
devise_for :users, :controllers => { :registrations =>
'registrations' }
...
end

But in the process of confirmation,

No route matches {:action=>"create",
:controller=>"devise/confirmations",
:confirmation_token=>"W65sGSMU9TNQwJDRzNzV"}

appears.
There is a similar issue such as
https://github.com/plataformatec/devise/issues/815
But I don't quite understand what to do as explained in this URL.

"Yes, you need to copy the views to your application and change the
confirmation_url (and all other calls) to pass the locale as parameter.
Another option is to configure default_url_options to include :locale.
There is probably something in the wiki, if not, check Rails
documentation."

Could anyone explain this to me more specifically?

soichi

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