I've worked out how to do it using the AliasPlugin. In case anyone's interested:
In MainMenu: <<alias chinese "[[Chinese|http://translate.google.com/#en|zh-CN| %0]]">> <<alias arabic "[[Arabic|http://translate.google.com/#en|ar|%0]]">> <<alias russian "[[Russian|http://translate.google.com/#en|ru|%0]]">> In each tiddler: <<chinese {{tiddler.title}}>> <<arabic {{tiddler.title}}>> <<russian {{tiddler.title}}>> -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/tiddlywiki?hl=en.

