Yes, the International vs English labels are very misleading. There is absolutely no difference in the LimeWire that is installed. The difference is really the installer itself -- the international one makes sure that the Java being used by LimeWire supports international characters. The English one uses the most recent JRE (which may not support international characters). We're experimenting with ways to merge the installers and intelligently choose which JRE to use/download.

Unfortunately, the International installer uses Java 1.3, which had a bug (or really, a different return value for a method) that caused LimeWire to think it couldn't display any language. That bug is now fixed and will be released in LimeWire 4.2.3.