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.
- http://wiki-translation.com -> The solution is here! and in Tiki 2.0
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):
- Author A creates page Foo in English.
- Author B creates page Bar in Spanish.
- 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).