Superseded by Plural-Support
Tracking bug for all issues related to plural rules support. Should mostly be implementation in specific messages nowadays, and it's the responsibility of the maintainers of the specific piece of code or of volunteers in these cases (as far as I know).
Note that many many more requests are among the https://translatewiki.net/wiki/Support/Open_requests
URL: https://www.mediawiki.org/w/index.php?title=Manual:Messages_API&oldid=645340#Add_PLURAL_support
See also: T32443: [DO NOT USE] GENDER (tracking) [superseded by #Gender-Support]