engine/app/cells/locomotive/content_locale_picker_cell.rb

module Locomotive
  class ContentLocalePickerCell < Cell::Base

    def show(args)
      site    = args[:site]
      locale  = args[:locale].to_s

      if site.locales.empty? || site.locales.size < 2
        ''
      else
        @locales = site.locales - [locale]
        render
      end
    end

  end
end