MultilingualWikiSync

Apparently, no "current wiki engines do not support the efficient creation and maintenance of such content"

This video from the The Cross Lang Wiki project explains it all.

Interesting links:

• http://wiki-translation.com -> The solution is here! and in Tiki 2.0
• http://i18n.tikiwiki.org
• http://drone-alliance.org/wordpress/2006/08/20/i18n-revisited/
• http://drone-alliance.org/wordpress/2004/08/28/multilingual-collaborative-websites/#more-5
• http://www.itia.ntua.gr/~anthony/tmp/multilangwikis.html
• http://meta.wikimedia.org/wiki/Enhanced_Translation
• http://meta.wikimedia.org/wiki/Translation
• http://tikiwiki.org/tiki-directory_browse.php?parent=65

Is simply sending notifications enough?

Well, this doesn't fully address the concerns, but does at least let language-specific page authors know when they need to update a translation (plus it seems like something easy to implement):

1. Author A creates page Foo in English.
2. Author B creates page Bar in Spanish.
3. Pages A and B are specified as translations of each other. As such, any time one page is updated, the owner of the other page receives a "translation notification" (similar to a "watched page" email).