i18n with Rails 4 enums (https://stackoverflow.com/a/36335591/2640073)

_example.rb

Business.human_enum_name(:kind, :company) #=> "Pessoa juridíca"
Business.human_enum_name(:kind, :person) #=> "Pessoa física"

Business.human_enum_name(:status, :active) #=> "Ativa"
Business.human_enum_name(:status, :inactive) #=> "Inativa"
Business.human_enum_name(:status, :closed) #=> "Fechada"

application_record.rb

# models/application_record.rb
class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true

  def self.human_enum_name(enum_name, enum_value)
    model_name_i18n_key = model_name.i18n_key
    pluralized_enum_name = enum_name.to_s.pluralize

    defaults = []

    defaults << :"activerecord.attributes.#{model_name_i18n_key}.#{pluralized_enum_name}.#{enum_value}"
    defaults << :"attributes.#{pluralized_enum_name}.#{enum_value}"

    defaults << enum_value.to_s.humanize

    I18n.t(defaults.shift, default: defaults)
  end
end

business.rb

# models/business.rb
class Business < ApplicationRecord
  enum kind: { company: 'company', person: 'person' }, _default: 'company'
  enum status: { active: 'active', inactive: 'inactive', closed: 'closed' }, _default: 'active'
end

pt-BR.yml

# config/pt-BR.yml
pt-BR:
  activerecord:
    attributes:
      business:
        kinds:
          company: "Pessoa jurídica"
          person: "Pessoa física"
        statuses:
          active: "Ativa"
          inactive: "Inativa"
          closed: "Fechada"