immich is a self hosted google photos alternative, it finds faces, groups them, lets you name people etc, object recognition works similarly, it lets you search by terms like “dog” etc. you can use the phone app to sync your photos with it (i sync mine using syncthing though), here’s a demo
Yeah, it’s my minor pet peeve with Duolingo, like source language and my language doesn’t have/need suffixes like “the” or “a” so I often forget about it, it’s soo annoying to fail because of such minor thing, especially when their suggested English often looks terrible