A much needed update

Finally an update for the FR24 card. After a period of absence due to holidays, work and other obligations, work has been done again on an - now much needed - update.

In this update, we've worked on improving the notification when no aircraft are found (#16) and modified the map to use browser_mod 2 (#19).

Note if you use the popup option: this update is not compatible with old versions of browser_mod. If you don't want to update browser_mod, that's fine, but unfortunately you can't use this update either.