How to translate model in Ruby class/module namespace?

I have checked 'model_name.human' source code and found 'i18n_key' method. I have tried this:

irb(main):006:0> Products::Car.model_name.i18n_key
=> :"products/car"

Then I changed my yml file to this:

activerecord:    
  models:
    products/car: "Автомобиль"   
  attributes:
    products/car:
      owner: "Владелец"

and it works!

EDIT:

For further reference: the i18n_key is set in the initializer of ActiveModel::Name https://github.com/rails/rails/blob/375a4143cf5caeb6159b338be824903edfd62836/activemodel/lib/active_model/naming.rb#L147

and it is simply based on

MyClass.name.underscore