Could you update this code in the same way I suggested for #2169?
```ruby
def translation_per_model(resource_class, action, model_label)
  I18n.t "active_admin.#{resource_class.to_s.downcase}.#{action}",
    :model   => model_label,
    :default => proc{ I18n.t "active_admin.#{action}", :model => model_label }
end
```