URL helper for middleman : translate the same page in another language

URL_helper.rb

module URLHelper

  def link_translate(lang)
    return link_to data.languages.send(lang.to_s),
    if lang === I18n.default_locale
      config[:host] + '/' +
      path_translate(lang) +
      t("paths.#{current_page.data.title}", locale: lang)
    else
      config[:host] + '/' +
      lang.to_s + '/' +
      path_translate(lang) +
      t("paths.#{current_page.data.title}", locale: lang)
    end
  end

  def path_translate(lang)
    begin
      current_page.data.dir.map { |dir| t("paths.#{dir}", locale: lang) + '/'}.join('/')
    rescue
      return ''
    end
  end

end