Things have changed since I last localized a Drupal contrib module of mine. In D9/10, having a
translations folder with
.po files no longer seems to be the usual route. Yes, it can be done for local custom modules by specifying the location in the
info.yml but I'm looking for a solution for regular, d.o hosted contrib modules. Right now I don't even need many languages, just one, the (Commerce) module in question applies to a single country, so the translation should obviously come directly for anybody installing the module.
I'm aware of this question but it's unanswered.