If you want to add custom label to the wishlist button, then copy and paste this code to the functions.php
file.
add_filter('wishlist_button_save_label', 'wishlist_button_save_label_20201908', 5); function wishlist_button_save_label_20201908($save_html){ $save_html = 'Custom label'; return $save_html; }
![wishlist_save_label 1 wishlist_save_label 1](https://i.imgur.com/JvYXD7K.png)