I see that ql 2.2.1 included a fix for titlecase:

- Title case: Improved title casing for English text.

But that change completely defeats the way in which I have been using that
plugin. That's fine, but QL seems to assume that the whole world writes English
because the plugin's behaviour does not change when I switch locales.

Kindly fix this such that
$ LANG=C exfalso
uses the old behaviour again, or add a new Titlecase Every Word plugin.