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.
Version: 1.9.x
Severity: normal
OS: Windows 2000
Platform: PC
URL: http://meta.wikimedia.org/wiki/Help_Forum#Wiki-Markup:_language_of_Wikimedia_article