Thomas Francart, 22/06/20 16:21:
I also cannot use these 2 codes when editing through the human interface.
Language code validation on Wikidata is sometimes confusing. See also: https://phabricator.wikimedia.org/T39459
Why "mis" instead of "und"? See also https://phabricator.wikimedia.org/T230833#6103004
Federico