plone/Products.LinguaPlone — pull request #10 by erral (2012-09-06 07:41:23+00:00)
Title: Add a viewlet to mark the translated content of the current page, to help search engines crawl the content

This markup was suggested by Google at:

http://googlewebmastercentral.blogspot.com.es/2011/12/new-markup-for-multilingual-content.html