[[:Category:head tracking/no pos]]
Splitting it by language would lead to the creation of lots of categories. So instead it uses a template for tracking. If you edit an entry and look at the templates it transcluded, you'll see a few redlinked templates there that track the language. It's cleaner and less intrusive that way.
The reason for always including a part of speech has to do with the recent change to have lemma and non-lemma categories. The template can only determine which of the two categories to add an entry to if a part of speech is provided. So without a part of speech, the entry will not be categorised in a lemma/non-lemma category.
I was gonna fix all the French entries, but I can no longer find them!
They should be at Special:WhatLinksHere/Template:tracking/head tracking/no pos/lang/fr.