Please add the language code cnr to the list of language codes supported for monolingual text values.
Usage example: https://www.wikidata.org/wiki/Q7700307#P1705
Requested here: https://www.wikidata.org/w/index.php?title=Wikidata:Contact_the_development_team&oldid=623706024#Monolingual_string_language_code_(%22cnr%22)