Seems a new version of SNEmulDS will be out soon. Here is some information directly from it’s homepage:

The new version of SNEmulDS 0.6 comes closer… The new GUI is nearly finished and is being integrated to the main core. I’m waiting for artworks from my friend to complete the GUI design.

A new feature of the next release will be multi-language support. For the moment, the language setting is read from the DS firmware, and the charset used is ANSI Western occidental (Windows-1252) so the translation is limited to : English, French, German, Spanish, and Italiano. But in future, Japanese and other language will be included.

All language has been translated already ! Thanks! Others languagues are welcomed to, but will be not included in next release. If you wish to translate in Japanese, i would be interested by a translation using katakana first.