It looks like the official Mastodon app has been updated to use the terminology of the experimental web interface.
⭐️ Favourites are now called ❤️ Likes.
Trending is now called Explore (which is what it was called originally 😄 ).
This hasn't been rolled out to the release version of the web interface yet, so you probably won't see these changes on your server's website yet.
@FediTips I wonder what was wrong with favorites and the star