From TRAC Ticket #6946 (korakurider)

For not fully tranlated langauges it would be useful to fallback to language other than English when translation isn't registered for some phrase.

see discussion in http://lists.laptop.org/pipermail/etoys/2008-April/002141.html and threads pointed/following.

This feature needs several enhancement:

+ Enhancement to translation engine. Proposed patch (multiFallback-KR.1.cs) has been attached.

+ Enhancement to locale plugin so that multiple languages setting in base operating system (e.g. $LANGUAGE) will be passed to Etoys.

+ User interface for the setting in image.

Difficult point is how to control which font will be used for each language; it shouldn't be that one "universal" font covers all possible code points. So we might want to assign set of fonts when $LANGUAGE="mn:ja_JP", but this is not possible in current design of Squeak.