It doesn't support morphology. The fuzzy search should be enough for English and Swedish.
I've managed to get Spanish to work quite well by using certain Wiktionary dictionaries for it. You could try and see if French is also supported well enough.
Try checking out this:
https://github.com/BoboTiG/ebook-rea...s/fr/README.md (French-French Wiktionary)
Or for a French-English one:
https://github.com/Vuizur/Wiktionary...tardict.tar.gz