I haven't taken a closer look on how it works, but Wikipedia has "this page in other languages" link on some pages. Also, namespaces might be something worth using on the doc wiki.
See for example http://en.wikipedia.org/wiki/Finland, on the left side the is "in other languages" box with loads of languages. I wonder if this list is manually updated...
Moodle community sites
Moodle documentation: How about translation
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