I’ll give a gentle push to this topic, because I’m looking for answer to same question — this was my first hit from Google 
And now I’m off back to my search results…
Edit
I red his and trying to understand…
I have strong feeling it does actually nothing useful unless ispell, thesauru etc, are in use and those basically works only in english. There must be somekind schema, I reckon, but… I don’t know but big majority of hit results (and there wasn’t too many) led to chinese or russian sites, and I’ve learned ages ago that if chinese or russians need something because of language it surely doesn’t apply to finnish. Well… nothing apply to finnish (or estonians, hungarian etc.) when it is matter of language anyway 