Any advice to help my application stand out whilst in quarantine? Is learning many languages and doing work experience at a top law firm something universities would look for in a student?
The best you can do while in quarantine is to get good grades and continue your schoolwork.
Learning languages isn’t necessarily an important thing. Unless you can learn 5+ languages close to fluency, it probably won’t make a difference in your app.
Doing work experience is obviously a plus, but I’m not sure if you can do that while in quarantine.
You should go ahead and look around for summer internships or programs (if they haven’t been cancelled yet) to help make the most of your summer.