Last modified: 2012-03-26 18:02:04 UTC
http://meta.wikimedia.org/wiki/Help_Forum#Wiki- Markup:_language_of_Wikimedia_article suggests, there is nothing said in the mediawiki help pages about how to tag pages, sections, paragraphs, sentences, or single words of foreign languages. The short answer given on the page mentioned above could be good starting point.
As mentioned in the above URL, use <span lang="xx">your text</span> where: - 'your text' is a text in any language - 'xx' is a code representing the language used. If there is nothing said about it on mediawiki.org, feel free to add it somewhere :)
Probably a duplicate of 10736 and/or bug 30422.
