Gender support broken

Sorry for the slow response. Yes, it works—I tested it on Portal:Hu/terminology.json by manually setting the message with mw.messages.set('gadget-term-json-intro', '{{GENDER:$1|he|she|they}}') on the browser console before the gadget loaded the missing messages (so it wasn’t missing by that time and thus didn’t get overwritten), and in logged in state I got he, while logged out it displayed they, as expected.

Great! Would you mind telling me how you set the message in the console before the messages are loaded? I am not aware of how to make sure something I put in console is done before anything on the page happens…

No magic here – I prepared the command in the console, hit F5 and hoped that I hit Enter at the right time, not too early (before mw.messages.set is available) and not too late. In logged out state it was even easier: since this is not a default gadget yet, I had to manually load the appropriate ResourceLoader module, so I simply set the message before I started loading the module.