Update Italian language (#20663)

Marlin/src/lcd/language/language_it.h

   #endif
   PROGMEM Language_Str MSG_PREHEAT_CUSTOM                  = _UxGT("Prerisc.personal.");
   PROGMEM Language_Str MSG_COOLDOWN                        = _UxGT("Raffredda");
+
   PROGMEM Language_Str MSG_CUTTER_FREQUENCY                = _UxGT("Frequenza");
   PROGMEM Language_Str MSG_LASER_MENU                      = _UxGT("Controllo laser");
-  PROGMEM Language_Str MSG_LASER_POWER                     = _UxGT("Potenza laser");
   PROGMEM Language_Str MSG_SPINDLE_MENU                    = _UxGT("Controllo mandrino");
+  PROGMEM Language_Str MSG_LASER_POWER                     = _UxGT("Potenza laser");
   PROGMEM Language_Str MSG_SPINDLE_POWER                   = _UxGT("Potenza mandrino");
+  PROGMEM Language_Str MSG_LASER_TOGGLE                    = _UxGT("Alterna Laser");
+  PROGMEM Language_Str MSG_SPINDLE_TOGGLE                  = _UxGT("Alterna mandrino");
+  PROGMEM Language_Str MSG_SPINDLE_FORWARD                 = _UxGT("Mandrino in avanti");
   PROGMEM Language_Str MSG_SPINDLE_REVERSE                 = _UxGT("Inverti mandrino");
+
   PROGMEM Language_Str MSG_SWITCH_PS_ON                    = _UxGT("Accendi aliment.");
   PROGMEM Language_Str MSG_SWITCH_PS_OFF                   = _UxGT("Spegni aliment.");
   PROGMEM Language_Str MSG_EXTRUDE                         = _UxGT("Estrudi");
   PROGMEM Language_Str MSG_RESUME_PRINT                    = _UxGT("Riprendi stampa");
   PROGMEM Language_Str MSG_HOST_START_PRINT                = _UxGT("Host Avvio");
   PROGMEM Language_Str MSG_STOP_PRINT                      = _UxGT("Arresta stampa");
+  PROGMEM Language_Str MSG_END_LOOPS                       = _UxGT("Fine cicli di rip.");
   PROGMEM Language_Str MSG_PRINTING_OBJECT                 = _UxGT("Stampa Oggetto");
   PROGMEM Language_Str MSG_CANCEL_OBJECT                   = _UxGT("Cancella Oggetto");
   PROGMEM Language_Str MSG_CANCEL_OBJECT_N                 = _UxGT("Canc. Oggetto =");