Fix formatting directive in it.po
Fixes: (gpartedbin:78003): glibmm-WARNING **: 22:55:05.465: invalid substitution "%s" in fmt string "percorso: %1 (%s)"
Edited by Mike Fleetwood
Fixes: (gpartedbin:78003): glibmm-WARNING **: 22:55:05.465: invalid substitution "%s" in fmt string "percorso: %1 (%s)"