Differentiate translated On/Off from Serial ON/OFF

Marlin/src/core/language.h

 #define MSG_ERR_M428_TOO_FAR                "Too far from reference point"
 #define MSG_ERR_M303_DISABLED               "PIDTEMP disabled"
 #define MSG_M119_REPORT                     "Reporting endstop status"
+#define MSG_ON                              "ON"
+#define MSG_OFF                             "OFF"
 #define MSG_ENDSTOP_HIT                     "TRIGGERED"
 #define MSG_ENDSTOP_OPEN                    "open"
 #define MSG_HOTEND_OFFSET                   "Hotend offsets:"

Marlin/src/core/serial.cpp

  */
 
 #include "serial.h"
+#include "language.h"
 
 uint8_t marlin_debug_flags = MARLIN_DEBUG_NONE;
 
   while (char ch = pgm_read_byte(str++)) SERIAL_CHAR(ch);
 }
 
+void serial_echo_start()  { serialprintPGM(echomagic); }
+void serial_error_start() { serialprintPGM(errormagic); }
+
 void serial_echopair_PGM(PGM_P s_P, const char *v)   { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_PGM(PGM_P s_P, char v)          { serialprintPGM(s_P); SERIAL_CHAR(v); }
 void serial_echopair_PGM(PGM_P s_P, int v)           { serialprintPGM(s_P); SERIAL_ECHO(v); }
 
 void serial_spaces(uint8_t count) { count *= (PROPORTIONAL_FONT_RATIO); while (count--) SERIAL_CHAR(' '); }
 
-void serial_echo_start()  { serialprintPGM(echomagic); }
-void serial_error_start() { serialprintPGM(errormagic); }
+void serialprint_onoff(const bool onoff) { serialprintPGM(onoff ? PSTR(MSG_ON) : PSTR(MSG_OFF)); }
+void serialprintln_onoff(const bool onoff) { serialprint_onoff(onoff); SERIAL_EOL(); }
 
 #if ENABLED(DEBUG_LEVELING_FEATURE)
 

Marlin/src/core/serial.h

 void serialprintPGM(PGM_P str);
 void serial_echo_start();
 void serial_error_start();
+void serialprint_onoff(const bool onoff);
+void serialprintln_onoff(const bool onoff);
 
 #if ENABLED(DEBUG_LEVELING_FEATURE)
   void print_xyz(PGM_P prefix, PGM_P suffix, const float x, const float y, const float z);

Marlin/src/gcode/bedlevel/M420.cpp

   }
 
   SERIAL_ECHO_START();
-  SERIAL_ECHOLNPAIR("Bed Leveling ", planner.leveling_active ? MSG_ON : MSG_OFF);
+  SERIAL_ECHOPGM("Bed Leveling ")
+  serialprintln_onoff(planner.leveling_active);
 
   #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
     SERIAL_ECHO_START();

Marlin/src/gcode/bedlevel/mbl/G29.cpp

   switch (state) {
     case MeshReport:
       if (leveling_is_valid()) {
-        SERIAL_PROTOCOLLNPAIR("State: ", planner.leveling_active ? MSG_ON : MSG_OFF);
+        SERIAL_PROTOCOLPGM("State: ");
+        serialprintln_onoff(planner.leveling_active);
         mbl.report_mesh();
       }
       else

Marlin/src/gcode/control/M211.cpp

 void GcodeSuite::M211() {
   SERIAL_ECHO_START();
   SERIAL_ECHOPGM(MSG_SOFT_ENDSTOPS);
-  #if HAS_SOFTWARE_ENDSTOPS
-    if (parser.seen('S')) soft_endstops_enabled = parser.value_bool();
-    serialprintPGM(soft_endstops_enabled ? PSTR(MSG_ON) : PSTR(MSG_OFF));
-  #else
-    SERIAL_ECHOPGM(MSG_OFF);
-  #endif
+  if (parser.seen('S')) soft_endstops_enabled = parser.value_bool();
+  serialprint_onoff(soft_endstops_enabled);
   SERIAL_ECHOPGM(MSG_SOFT_MIN);
   SERIAL_ECHOPAIR(    MSG_X, LOGICAL_X_POSITION(soft_endstop_min[X_AXIS]));
   SERIAL_ECHOPAIR(" " MSG_Y, LOGICAL_Y_POSITION(soft_endstop_min[Y_AXIS]));

Marlin/src/gcode/control/M605.cpp

     planner.synchronize();
     extruder_duplication_enabled = parser.intval('S') == (int)DXC_DUPLICATION_MODE;
     SERIAL_ECHO_START();
-    SERIAL_ECHOLNPAIR(MSG_DUPLICATION_MODE, extruder_duplication_enabled ? MSG_ON : MSG_OFF);
+    SERIAL_ECHOPGM(MSG_DUPLICATION_MODE);
+    serialprintln_onoff(extruder_duplication_enabled);
   }
 
 #endif // DUAL_NOZZLE_DUPLICATION_MODE

Marlin/src/lcd/language/language_an.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Temperatura Auto.")
-#define MSG_ON                              _UxGT("On")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_bg.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" Максимум")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Фактор")
 #define MSG_AUTOTEMP                        _UxGT("Авто-темп.")
-#define MSG_ON                              _UxGT("Вкл. ")
-#define MSG_OFF                             _UxGT("Изкл. ")
+#define MSG_LCD_ON                          _UxGT("Вкл.")
+#define MSG_LCD_OFF                         _UxGT("Изкл.")
 #define MSG_A_RETRACT                       _UxGT("A-откат")
 #define MSG_A_TRAVEL                        _UxGT("A-travel")
 #define MSG_STEPS_PER_MM                    _UxGT("Стъпки/mm")

Marlin/src/lcd/language/language_ca.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_cz.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fakt")
 #define MSG_AUTOTEMP                        _UxGT("Autoteplota")
-#define MSG_ON                              _UxGT("Zap")
-#define MSG_OFF                             _UxGT("Vyp")
+#define MSG_LCD_ON                          _UxGT("Zap")
+#define MSG_LCD_OFF                         _UxGT("Vyp")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_da.h

 #define MSG_MAX                             _UxGT(" \002 Max")
 #define MSG_FACTOR                          _UxGT(" \002 Fact")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("Til ")
-#define MSG_OFF                             _UxGT("Fra")
+#define MSG_LCD_ON                          _UxGT("Til")
+#define MSG_LCD_OFF                         _UxGT("Fra")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_de.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" max")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Faktor")
 #define MSG_AUTOTEMP                        _UxGT("Auto Temperatur")
-#define MSG_ON                              _UxGT("Ein")
-#define MSG_OFF                             _UxGT("Aus")
+#define MSG_LCD_ON                          _UxGT("Ein")
+#define MSG_LCD_OFF                         _UxGT("Aus")
 #define MSG_PID_P                           _UxGT("PID P")
 #define MSG_PID_I                           _UxGT("PID I")
 #define MSG_PID_D                           _UxGT("PID D")

Marlin/src/lcd/language/language_el-gr.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Αυτομ. ρύθμιση θερμοκρασίας")
-#define MSG_ON                              _UxGT("Ενεργοποιημένο")
-#define MSG_OFF                             _UxGT("Απενεργοποιημένο")
+#define MSG_LCD_ON                          _UxGT("Ενεργοποιημένο")
+#define MSG_LCD_OFF                         _UxGT("Απενεργοποιημένο")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_el.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Αυτομ ρύθμιση θερ/σίας") //SHORTEN
-#define MSG_ON                              _UxGT("Ενεργοποιημένο")
-#define MSG_OFF                             _UxGT("Απενεργοποιημένο")
+#define MSG_LCD_ON                          _UxGT("Ενεργοποιημένο")
+#define MSG_LCD_OFF                         _UxGT("Απενεργοποιημένο")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_en.h

   #define MSG_AUTOTEMP                        _UxGT("Autotemp")
 #endif
 #ifndef MSG_ON
-  #define MSG_ON                              _UxGT("On ")
+  #define MSG_LCD_ON                          _UxGT("On")
 #endif
 #ifndef MSG_OFF
-  #define MSG_OFF                             _UxGT("Off")
+  #define MSG_LCD_OFF                         _UxGT("Off")
 #endif
 #ifndef MSG_PID_P
   #define MSG_PID_P                           _UxGT("PID-P")

Marlin/src/lcd/language/language_es.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Temperatura Auto.")
-#define MSG_ON                              _UxGT("Encender")
-#define MSG_OFF                             _UxGT("Apagar")
+#define MSG_LCD_ON                          _UxGT("Encender")
+#define MSG_LCD_OFF                         _UxGT("Apagar")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_eu.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fakt")
 #define MSG_AUTOTEMP                        _UxGT("Auto tenperatura")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_fi.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Kerr")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_fr.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Facteur")
 #define MSG_AUTOTEMP                        _UxGT("Temp. Auto.")
-#define MSG_ON                              _UxGT("Marche ")
-#define MSG_OFF                             _UxGT("Arrêt")
+#define MSG_LCD_ON                          _UxGT("Marche")
+#define MSG_LCD_OFF                         _UxGT("Arrêt")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_gl.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_hr.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_it.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_jp-kana.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" サイコウ") // " Max"
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" ファクター") // " Fact"
 #define MSG_AUTOTEMP                        _UxGT("ジドウオンドセイギョ")               // "Autotemp"
-#define MSG_ON                              _UxGT("オン ")                         // "On "
-#define MSG_OFF                             _UxGT("オフ ")                         // "Off"
+#define MSG_LCD_ON                          _UxGT("オン")                         // "On"
+#define MSG_LCD_OFF                         _UxGT("オフ")                         // "Off"
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_ko_KR.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_nl.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")
-#define MSG_ON                              _UxGT("Aan ")
-#define MSG_OFF                             _UxGT("Uit")
+#define MSG_LCD_ON                          _UxGT("Aan")
+#define MSG_LCD_OFF                         _UxGT("Uit")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_pl.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Mnożnik")
 #define MSG_AUTOTEMP                        _UxGT("Auto. temperatura")
-#define MSG_ON                              _UxGT("Wł. ")
-#define MSG_OFF                             _UxGT("Wył.")
+#define MSG_LCD_ON                          _UxGT("Wł.")
+#define MSG_LCD_OFF                         _UxGT("Wył.")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_pt-br.h

 #define MSG_MAX                             LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          LCD_STR_THERMOMETER _UxGT(" Fator")
 #define MSG_AUTOTEMP                        _UxGT("Temp. Automática")
-#define MSG_ON                              _UxGT("Ligado ")
-#define MSG_OFF                             _UxGT("Desligado")
+#define MSG_LCD_ON                          _UxGT("Ligado")
+#define MSG_LCD_OFF                         _UxGT("Desligado")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_pt.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fact")
 #define MSG_AUTOTEMP                        _UxGT("Temp. Automática")
-#define MSG_ON                              _UxGT("On ")
-#define MSG_OFF                             _UxGT("Off")
+#define MSG_LCD_ON                          _UxGT("On")
+#define MSG_LCD_OFF                         _UxGT("Off")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_ru.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Макс")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Фактор")
 #define MSG_AUTOTEMP                        _UxGT("Автотемпература")
-#define MSG_ON                              _UxGT("Вкл.")
-#define MSG_OFF                             _UxGT("Выкл.")
+#define MSG_LCD_ON                          _UxGT("Вкл.")
+#define MSG_LCD_OFF                         _UxGT("Выкл.")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_sk.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Fakt")
 #define MSG_AUTOTEMP                        _UxGT("Auto-teplota")
-#define MSG_ON                              _UxGT("Zap")
-#define MSG_OFF                             _UxGT("Vyp")
+#define MSG_LCD_ON                          _UxGT("Zap")
+#define MSG_LCD_OFF                         _UxGT("Vyp")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_tr.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Max")                //  Max
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Çarpan")             //  Çarpan
 #define MSG_AUTOTEMP                        _UxGT("Autotemp")                                           //  Autotemp
-#define MSG_ON                              _UxGT("On ")                                                // On
-#define MSG_OFF                             _UxGT("Off")                                                // Off
+#define MSG_LCD_ON                          _UxGT("On")                                                 // On
+#define MSG_LCD_OFF                         _UxGT("Off")                                                // Off
 #define MSG_PID_P                           _UxGT("PID-P")                                              // PID-P
 #define MSG_PID_I                           _UxGT("PID-I")                                              // PID-I
 #define MSG_PID_D                           _UxGT("PID-D")                                              // PID-D

Marlin/src/lcd/language/language_uk.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Макс")
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" Факт")
 #define MSG_AUTOTEMP                        _UxGT("Автотемпер.")
-#define MSG_ON                              _UxGT("Увімк.")
-#define MSG_OFF                             _UxGT("Вимк. ")
+#define MSG_LCD_ON                          _UxGT("Увімк.")
+#define MSG_LCD_OFF                         _UxGT("Вимк.")
 #define MSG_PID_P                           _UxGT("PID-P")
 #define MSG_PID_I                           _UxGT("PID-I")
 #define MSG_PID_D                           _UxGT("PID-D")

Marlin/src/lcd/language/language_zh_CN.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" 最大")  //" " LCD_STR_THERMOMETER " Max"
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" 因数")  //" " LCD_STR_THERMOMETER " Fact"
 #define MSG_AUTOTEMP                        _UxGT("自动控温")  //"Autotemp"
-#define MSG_ON                              _UxGT("开 ")  //"On "
-#define MSG_OFF                             _UxGT("关 ")  //"Off"
+#define MSG_LCD_ON                          _UxGT("开")  //"On"
+#define MSG_LCD_OFF                         _UxGT("关")  //"Off"
 #define MSG_PID_P                           _UxGT("PID-P")  //"PID-P"
 #define MSG_PID_I                           _UxGT("PID-I")  //"PID-I"
 #define MSG_PID_D                           _UxGT("PID-D")  //"PID-D"

Marlin/src/lcd/language/language_zh_TW.h

 #define MSG_MAX                             _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" 最大")  //" " LCD_STR_THERMOMETER " Max"
 #define MSG_FACTOR                          _UxGT(" ") LCD_STR_THERMOMETER _UxGT(" 系數")  //" " LCD_STR_THERMOMETER " Fact"
 #define MSG_AUTOTEMP                        _UxGT("自動控溫")  //"Autotemp"
-#define MSG_ON                              _UxGT("開 ")  //"On "
-#define MSG_OFF                             _UxGT("關 ")  //"Off"
+#define MSG_LCD_ON                          _UxGT("開")  //"On"
+#define MSG_LCD_OFF                         _UxGT("關")  //"Off"
 #define MSG_PID_P                           _UxGT("PID-P")  //"PID-P"
 #define MSG_PID_I                           _UxGT("PID-I")  //"PID-I"
 #define MSG_PID_D                           _UxGT("PID-D")  //"PID-D"

Marlin/src/lcd/menu/menu.h

   #define draw_menu_item_setting_edit_generic(sel, row, pstr, data) _drawmenu_setting_edit_generic(sel, row, pstr, data, false)
   #define draw_menu_item_setting_edit_generic_P(sel, row, pstr, data) _drawmenu_setting_edit_generic(sel, row, pstr, data, true)
   #define DRAWMENU_SETTING_EDIT_GENERIC(SRC) draw_menu_item_setting_edit_generic(sel, row, pstr, SRC)
-  #define DRAW_BOOL_SETTING(sel, row, pstr, data) draw_menu_item_setting_edit_generic_P(sel, row, pstr, (*(data))?PSTR(MSG_ON):PSTR(MSG_OFF))
+  #define DRAW_BOOL_SETTING(sel, row, pstr, data) draw_menu_item_setting_edit_generic_P(sel, row, pstr, (*(data))?PSTR(MSG_LCD_ON):PSTR(MSG_LCD_OFF))
   #if ENABLED(BABYSTEP_ZPROBE_GFX_OVERLAY) || ENABLED(MESH_EDIT_GFX_OVERLAY)
     void _lcd_zoffset_overlay_gfx(const float zvalue);
   #endif
   void draw_menu_item_setting_edit_generic(const bool sel, const uint8_t row, const char* pstr, const char pre_char, const char* const data);
   void draw_menu_item_setting_edit_generic_P(const bool sel, const uint8_t row, const char* pstr, const char pre_char, const char* const data);
   #define DRAWMENU_SETTING_EDIT_GENERIC(SRC) draw_menu_item_setting_edit_generic(sel, row, pstr, '>', SRC)
-  #define DRAW_BOOL_SETTING(sel, row, pstr, data) draw_menu_item_setting_edit_generic_P(sel, row, pstr, '>', (*(data))?PSTR(MSG_ON):PSTR(MSG_OFF))
+  #define DRAW_BOOL_SETTING(sel, row, pstr, data) draw_menu_item_setting_edit_generic_P(sel, row, pstr, '>', (*(data))?PSTR(MSG_LCD_ON):PSTR(MSG_LCD_OFF))
 #endif
 #define draw_menu_item_submenu(sel, row, pstr, data) draw_menu_item_generic(sel, row, pstr, '>', LCD_STR_ARROW_RIGHT[0])
 #define draw_menu_item_gcode(sel, row, pstr, gcode) draw_menu_item_generic(sel, row, pstr, '>', ' ')