The gender support for "you" should be discussed by people who speak the affected languages.
"I'm not sure what gender support you expect and why. Currently the {{GENDER:...}} keyword occurs only once, in the message "wikibase-mylanguagefallbackchain-babel", and I'm not even sure if it's used right. "You" occurs 74 times in Wikibase messages. I don't think all of them should have a {{GENDER:...}} keyword. We need users that are able to speak a language where this is important and tell us which words in which messages need gender support. The best way to do this is to edit all our en.json (we currently have 3 for client/lib/repo) and submit that edit as a patch to Gerrit."
https://phabricator.wikimedia.org/T90431