I18nKonjac

gem "i18n_konjac"

class AddTitleToBlogs < ActiveRecord::Migration
  def change
    add_column :blogs, :title, :string
    add_column :blogs, :ja_title, :string
    add_column :blogs, :fr_title, :string
  end
end

class Blog < ActiveRecord::Base
  acts_as_konjac

  # ...
end

>> I18n.default_locale
# => :en

>> I18n.locale
# => :en
>> blog.title
# => "Support of Ruby 2.1 has ended"
>> blog.title_by_locale
# => "Support of Ruby 2.1 has ended"

>> I18n.locale = :ja
# => :ja
>> blog.title
# => "Support of Ruby 2.1 has ended"
>> blog.title_by_locale
# => "Ruby 2.1 公式サポート終了"


>> I18n.locale = :fr
# => :fr
>> blog.title
# => "Support of Ruby 2.1 has ended"
>> blog.title_by_locale
# => "
Le support de Ruby 2.1 s'est terminé"