Is your feature request related to a problem? Please describe.
The heart icon for adding a theme to my favorites looks floating in space without other visual traits that attach it to the page.

Describe the solution you'd like
Add a label to the button's left side:

• For the not added state: "Add to favorites"
• For the added state: "Added". in this case, the label could disappear after 2 secs.

Describe alternatives you've considered
If this solution takes big effort, we could just added a label for the first state; before clicking on the heart.