On the A340 (similar to A330) the ecam does display "s/f jammed proc ....... apply".
I like to add that there is a difference between s/f locked and s/f fault situations:
Locked: aircraft is easier to fly because normal law is active & AFS is avail (AP/FD/ATHR) plus characteristics speeds are avail as well.
Fault: AFS lost and no character speeds makes it a bit tough to fly + Altn then Direct law for landing.
I suggest that QRH be applied in such cases.
On A320, ECAM sometimes direct you to QRH. Ex. "Fuel gvty feed proc" in case of Emer elect configuration.
Thanks