French locale fix

Fixes bug in French locale , where user_panel.html shows "1 produit" in cart/panier when the the cart is in fact empty.  A similiar issue is fixed for the wishlist string. 

Bug can be verified by by setting language to 'fr' in settings.py 
LANGUAGE_CODE = "fr"
And add 
('fr', _('French')),
to LANGUAGES tuple.