Make primary CTA of My Books Dropper "Add to List" when logged out

Reduce confusion for patrons who click "Want to Read" expecting to get the book (for logged out patrons)

Author: mekarpeles

openlibrary/templates/my_books/primary_action.html

@@ -6,8 +6,10 @@
       $ message = _("Already Read")
     $elif read_status == 2:
       $ message = _("Currently Reading")
-    $else:
+    $elif user_key:
       $ message = _("Want to Read")
+    $else:
+      $ message = _("Add to List")
 
     $ action_value = 'remove' if read_status else 'add'
     $ bookshelf_id_value = read_status or '1'