Moved MSG_DEBUG in language.h

Marlin/language.h

 #define MSG_T_MAXTEMP                       "MAXTEMP triggered"
 #define MSG_T_MINTEMP                       "MINTEMP triggered"
 
+// Debug
+#define MSG_DEBUG_ECHO                      "DEBUG ECHO ENABLED"
+#define MSG_DEBUG_INFO                      "DEBUG INFO ENABLED"
+#define MSG_DEBUG_ERRORS                    "DEBUG ERRORS ENABLED"
+#define MSG_DEBUG_DRYRUN                    "DEBUG DRYRUN ENABLED"
 
 // LCD Menu Messages
 

Marlin/language_en.h

 #define MSG_END_MINUTE                      "minutes"
 #endif
 
-// Debug
-#ifndef MSG_DEBUG_ECHO
-#define MSG_DEBUG_ECHO                      "DEBUG ECHO ENABLED"
-#endif
-#ifndef MSG_DEBUG_INFO
-#define MSG_DEBUG_INFO                      "DEBUG INFO ENABLED"
-#endif
-#ifndef MSG_DEBUG_ERRORS
-#define MSG_DEBUG_ERRORS                    "DEBUG ERRORS ENABLED"
-#endif
-#ifndef MSG_DEBUG_DRYRUN
-#define MSG_DEBUG_DRYRUN                    "DEBUG DRYRUN ENABLED"
-#endif
-
 #ifdef DELTA_CALIBRATION_MENU
   #ifndef MSG_DELTA_CALIBRATE
   #define MSG_DELTA_CALIBRATE             "Delta Calibration"

Marlin/language_it.h

 #define MSG_END_HOUR                        "ore"
 #define MSG_END_MINUTE                      "minuti"
 
-// Debug
-#define MSG_DEBUG_ECHO                      "DEBUG RIPETI"
-#define MSG_DEBUG_INFO                      "DEBUG INFO"
-#define MSG_DEBUG_ERRORS                    "DEBUG ERRORI"
-#define MSG_DEBUG_DRYRUN                    "DEBUG STAMPA A VUOTO"
-
 #ifdef DELTA_CALIBRATION_MENU
     #define MSG_DELTA_CALIBRATE             "Calibraz. Delta"
     #define MSG_DELTA_CALIBRATE_X           "Calibra X"