`registrations/edit` page should have a translated heading

[JunichiIto]

resource_name.to_s.humanize always returns English name, but devise-i18n users would like to have translated name. So it should be resource.model_name.human instead of resource_name.to_s.humanize.

resource_name
#=> :user

resource_name.to_s.humanize
#=> "User"

resource
#=> #<User id: 10, email: "foo@example.com", created_at: "2023-02-24 02:50:05.580325000 +0000", updated_at: "2023-02-24 02:50:05.580325000 +0000">

resource.model_name.human
#=> "ユーザー"

Here is an example in Japanese mode: