Update Config_off.pm
Update Config_off.pm

Use iOS url as proposed on SO: http://stackoverflow.com/a/4560963/11963
openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server