For the moment we use the one of Xapian, we should see if we could not benefit of using an other one... and which one?

@veloman-yunkan suggested at #731 (comment):

After some research, I'd rather go with a more specialized spellchecker tool like https://github.com/hunspell/hunspell or https://github.com/nuspell/nuspell and generate input (dictionary) for the spellchecker from a filtered list of terms found in the titledb