Term placeholders/requests
That's the whole point. You might not know the word, but someone else who stumbles upon the page (perhaps by browsing through the category) might know. Either from the idea that it has to be similar to "Zira" or from the translation, or both. If it's an error, then it would still be caught by the editor or whoever is browsing the category. And who ever said it's only for specific cases? This could be used very widely. It hasn't been only because the template hasn't allowed it.
One tweak I would suggest is checking the namespace: people try out all kinds of nonstandard kluges in their user spaces- do we really want those cluttering up the request categories?
A further suggestion: change the name of the cat to "Entries missing <language name> terms". Right now it sort of implies that it should contain entries in the language requested, which is confusing.
{{poscatboiler}}
does not currently support that name, so it would mean making a new template.
Even "term requests" would be better, since we're marking the request, rather than the term.