The output of MediaWiki's info action should include an entry that lists "number of languages" for Wiktionary entries, possibly listing the languages. For example, https://en.wiktionary.org/wiki/taxi?action=info would list:
Languages (10): English, Dutch, French, Italian, Latin, Norwegian, Romanian, Spanish, Swedish, Walloon
Version: unspecified
Severity: enhancement