In response to this thread, I've created a list of language patches for DSiWare games, for use on DSi consoles with Unlaunch (optionally with TWiLight Menu++) installed, or 3DS consoles as a CIA file converted from the patched .nds file.
They are xDelta patches, so you'll need a...
DSiWare Language Patches
They are xDelta patches, so you'll need a...
DSiWare Language Patches
