The files are in usr\local\Kobo\hyphenDicts of the KoboRoot.tar which is inside the KoboRoot.tgz of the kobo update files. These hyphen dictionaries are released by Adobe. I have no idea where you can get one for Dutch or any language. Maybe they are part of InDesign. If you can get one you could try to make your own update file. But I am not sure whether the reader will pick it up at all.
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