I've replied to your email.
The last person I sent some English version files to changed the registry entry for the game to list 'English' as the language, and were able to install the latest English patch, which they said also helped with the translation.
If you are not comfortable with Registry editing, check out
this topic for the download and description of a reg file you can use, or Larian support can email you a much more user friendly vbs (Visual Basic Script) file to create / alter the required registry entries.
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