The Mandrake Powerpack 8.0 US English version contains shell script fragments which mention the 5 languages US English, UK English, French, German, and Spanish, and some translated text for the first 4. It seems that at least some of these languages have indeed been shipped, but it's extremely difficult to dig up copies, or even anyone who could confirm this.
Because the recognition engines of MS-Windows and Linux are the same, the language files can also be shared. IBM had instructions about how to do this on their website. It involves installing ViaVoice for MS-Windows, copying files to Linux, and fixing up a few things (mainly casing). It was suggested to use the MS-Windows ViaVoice Version 7 (Millennium) for this. A demo-version of this Millennium edition with a 30-day evaluation licence was available for free download from IBM. No-one seems to have a copy. If you do have a copy, please send me one (UK English, German, French). Noone knows whether newer versions of ViaVoice for MS-Windows have the same language files and can therefore be used as well.