Просматриваем путь к переводу полей формы #Rails 4.2

gistfile1.rb

#put to lib/i18n_ar_attribute_shower.rb
module ActiveModel

 # == Active \Model \Translation
 #
 # Provides integration between your object and the Rails internationalization
 # (i18n) framework.
 #
 # A minimal implementation could be:
 #
 #   class TranslatedPerson
 #     extend ActiveModel::Translation
 #   end
 #
 #   TranslatedPerson.human_attribute_name('my_attribute')
 #   # => "My attribute"
 #
 # This also provides the required class methods for hooking into the
 # Rails internationalization API, including being able to define a
 # class based +i18n_scope+ and +lookup_ancestors+ to find translations in
 # parent classes.
  module Translation
    include ActiveModel::Naming


    # Transforms attribute names into a more human format, such as "First name"
    # instead of "first_name".
    #
    #   Person.human_attribute_name("first_name") # => "First name"
    #
    # Specify +options+ with additional translating options.
    def human_attribute_name(attribute, options = {})
      options   = { count: 1 }.merge!(options)
      parts     = attribute.to_s.split(".")
      attribute = parts.pop
      namespace = parts.join("/") unless parts.empty?
      attributes_scope = "#{self.i18n_scope}.attributes"

      if namespace
        defaults = lookup_ancestors.map do |klass|
          :"#{attributes_scope}.#{klass.model_name.i18n_key}/#{namespace}.#{attribute}"
        end
        defaults << :"#{attributes_scope}.#{namespace}.#{attribute}"
      else
        defaults = lookup_ancestors.map do |klass|
          :"#{attributes_scope}.#{klass.model_name.i18n_key}.#{attribute}"
        end
      end

      defaults << :"attributes.#{attribute}"
      defaults << options.delete(:default) if options[:default]
      defaults << attribute.humanize

      options[:default] = defaults
      dsh = defaults.shift

      Rails.logger.tagged("I18n attribute only Rails 4.2!: #{attribute}") do
        Rails.logger.debug(dsh)
      end if Rails.logger

      I18n.translate(dsh, options)
    end
  end

 end
 
 
#config/application.rb on bottom of file
#require Rails.root.join('lib', 'i18n_ar_attribute_shower') if Rails.env.development?