discourse/app/helpers/js_locale_helper.rb

module JsLocaleHelper

  def self.output_locale(locale)

    locale_str = locale.to_s

    translations = YAML::load(File.open("#{Rails.root}/config/locales/client.#{locale_str}.yml"))

    # We used to split the admin versus the client side, but it's much simpler to just
    # include both for now due to the small size of the admin section.
    #
    # For now, let's leave it split out in the translation file in case we want to split
    # it again later, so we'll merge the JSON ourselves.
    admin_contents = translations[locale_str].delete('admin_js')

    translations[locale_str]['js'].merge!(admin_contents) if admin_contents.present?

    result  = "I18n.translations = #{translations.to_json};\n"
    result << "I18n.locale = '#{locale_str}'\n"
    result
  end

end