Bugs in Add to favourite

[horace_vr]

Nothing critical, mostly presentational:

1. On any cyclist's page, if I push "add to favourite", I am redirected to a blank white page
(the cyclist is added to my favourite list, though)

2. When a cyclist is already on my Favourite list, on the cyclist page (https://www.cyclingforfun.org/cff/vision.php?ciclistaid=xxxxx), I still see the 'Add to favourite" button. It should be 'Remove from favourite"

3. In World Challenges, https://www.cyclingforfun.org/cff/cartas.php
Non-active cards should have the message "Activate Card", not "Active Card"