LimeWire is working to create internationalized versions, and we should have this released for several languagues quite soon. This is separate from the problem of not allowing 2 byte (Unicode) searches. The real catch there is that we'd have to get consensus from all of the Gnutella developers to implement it, and that's not an easy task.
In terms of having versions of LimeWire for all languages, though, I strongly encourage anyone interested to join the mailing lists at
www.limewire.org and get involved. We have a working Dutch translation that could definitely use a second look, and we are still lacking a Korean translation.