Nikki added a comment.
But what would the correct statements be? We can't add an ISO 639-1 code if the language doesn't have one! :) All the ISO 639-1 codes which exist are (or should be) already in Wikidata - there's only ~200 and new ones are not being assigned any more. If we want to return anything other than `und` for the thousands of other potential languages, we would need to use something else like `P220` (ISO 639-3 code) or `P305` (IETF language tag). Using IETF language tags seems like the most useful solution to me. ISO 639-1 is too limited. Only using ISO 639-3 would be awkward because those are always three-letter codes (e.g. `en` would turn into `eng`, `de` into `deu`). Falling back to ISO 639-3 if there's no ISO 639-1 code would be an improvement, but that's essentially how IETF language tags are assigned - English has the ISO 639-1 code `en`, ISO 639-3 code `eng` and its IETF language tag is `en`, Scots only has the ISO 639-3 code `sco` and its IETF language tag is `sco`. Here's a query of all the languages being used for lexemes right now which don't have an ISO 639-1 code: https://w.wiki/PXQ TASK DETAIL https://phabricator.wikimedia.org/T230833 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Nikki Cc: Addshore, Lydia_Pintscher, Nikki, LucasWerkmeister, darthmon_wmde, Nandana, Mringgaard, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Jonas, Wikidata-bugs, aude, Mbch331
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