The default empty list message in the Favorite Pages macro is as follows:
There are currently no pages on your favourites list. You can add pages to this list by selecting Favourite from the Tools menu on the page you're viewing.
This text is incorrect, as pages are added to the list by selecting the "Save for later" button on any Confluence page. I've had a look at the macro and the documentation, https://confluence.atlassian.com/conf613/favorite-pages-macro-964960815.html (we are on Confluence 6.13.23), and there doesn't appear to be a way to update the empty list message. Is there any way of updating the message?