Adding a new language, ISO 639-3: ldn (Request)
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Fragment of a discussion from Support/LiquidThreads
phabricator ticket for the WD side of things: phab:T302705
update: patch has been submitted
update2: patch was edited to exclude ldn before being merged, but the topic is now in discussion at d:wikidata:report a technical problem#Adding a new language code, ISO 639-3: ldn (followup).