[Rails] translations for custom validation error messages

In validations, one can add a custom error message:
 

class Person < ActiveRecord::Base

  def a_method_used_for_validation_purposes

    errors.add(:name, "cannot contain the characters !@#%*()_-+=")

  end

end

How wil this message be translated when using I18n?
Can a key be passed instead of a message?

Cheers,
ace

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