Thread:Support/PLURAL keyword for languages without grammatical plural forms/reply

I see the problem. It is pretty obvious from Plural/Comparison_of_plural_rules_in_various_databases where ja and ko have implicit default n != 1 rule in MW while explicit no forms rules in other sets.

Short term fix is to avoid plural in messages, in longer term I think this would be appropritately solved by supporting explicit number forms like NaN undefineds.