Add placeholders for Bulgarian translation

Marlin/language_bg.h

 #define WELCOME_MSG                         MACHINE_NAME " Готов."
 #define MSG_SD_INSERTED                     "Картата е поставена"
 #define MSG_SD_REMOVED                      "Картата е извадена"
+#define MSG_LCD_ENDSTOPS                    "Endstops" // Max length 8 characters
 #define MSG_MAIN                            "Меню"
 #define MSG_AUTOSTART                       "Автостарт"
 #define MSG_DISABLE_STEPPERS                "Изкл. двигатели"
 #define MSG_AUTO_HOME                       "Паркиране"
+#define MSG_AUTO_HOME_X                     "Home X"
+#define MSG_AUTO_HOME_Y                     "Home Y"
+#define MSG_AUTO_HOME_Z                     "Home Z"
 #define MSG_LEVEL_BED_HOMING                "Homing XYZ"
 #define MSG_LEVEL_BED_WAITING               "Click to Begin"
+#define MSG_LEVEL_BED_NEXT_POINT            "Next Point"
 #define MSG_LEVEL_BED_DONE                  "Leveling Done!"
 #define MSG_LEVEL_BED_CANCEL                "Cancel"
 #define MSG_SET_HOME_OFFSETS                "Задай Начало"
 #define MSG_MOVE_1MM                        "Премести с 1mm"
 #define MSG_MOVE_10MM                       "Премести с 10mm"
 #define MSG_SPEED                           "Скорост"
+#define MSG_BED_Z                           "Bed Z"
 #define MSG_NOZZLE                          LCD_STR_THERMOMETER " Дюза"
 #define MSG_BED                             LCD_STR_THERMOMETER " Легло"
 #define MSG_FAN_SPEED                       "Вентилатор"
 #define MSG_PID_I                           "PID-I"
 #define MSG_PID_D                           "PID-D"
 #define MSG_PID_C                           "PID-C"
+#define MSG_SELECT                          "Select"
 #define MSG_ACC                             "Acc"
 #define MSG_VX_JERK                         "Vx-jerk"
 #define MSG_VY_JERK                         "Vy-jerk"
 #define MSG_VTRAV_MIN                       "VTrav min"
 #define MSG_AMAX                            "Amax "
 #define MSG_A_RETRACT                       "A-откат"
+#define MSG_A_TRAVEL                        "A-travel"
 #define MSG_XSTEPS                          "X стъпки/mm"
 #define MSG_YSTEPS                          "Y стъпки/mm"
 #define MSG_ZSTEPS                          "Z стъпки/mm"
 #define MSG_INIT_SDCARD                     "Иниц. SD-Карта"
 #define MSG_CNG_SDCARD                      "Смяна SD-Карта"
 #define MSG_ZPROBE_OUT                      "Z-сондата е извадена"
+#define MSG_BLTOUCH_SELFTEST                "BLTouch Self-Test"
+#define MSG_BLTOUCH_RESET                   "Reset BLTouch"
 #define MSG_HOME                            "Home"  // Used as MSG_HOME " " MSG_X MSG_Y MSG_Z " " MSG_FIRST
 #define MSG_FIRST                           "first"
 #define MSG_ZPROBE_ZOFFSET                  "Z Отстояние"
 #define MSG_BABYSTEP_Y                      "Министъпка Y"
 #define MSG_BABYSTEP_Z                      "Министъпка Z"
 #define MSG_ENDSTOP_ABORT                   "Стоп Кр.Изключватели"
+#define MSG_HEATING_FAILED_LCD              "Heating failed"
+#define MSG_ERR_REDUNDANT_TEMP              "Err: REDUNDANT TEMP"
+#define MSG_THERMAL_RUNAWAY                 "THERMAL RUNAWAY"
+#define MSG_ERR_MAXTEMP                     "Err: MAXTEMP"
+#define MSG_ERR_MINTEMP                     "Err: MINTEMP"
+#define MSG_ERR_MAXTEMP_BED                 "Err: MAXTEMP BED"
+#define MSG_ERR_MINTEMP_BED                 "Err: MINTEMP BED"
+#define MSG_ERR_Z_HOMING                    "G28 Z Forbidden"
+#define MSG_HALTED                          "PRINTER HALTED"
+#define MSG_PLEASE_RESET                    "Please reset"
+#define MSG_SHORT_DAY                       "d" // One character only
+#define MSG_SHORT_HOUR                      "h" // One character only
+#define MSG_SHORT_MINUTE                    "m" // One character only
+#define MSG_HEATING                         "Heating..."
+#define MSG_HEATING_COMPLETE                "Heating done."
+#define MSG_BED_HEATING                     "Bed Heating."
+#define MSG_BED_DONE                        "Bed done."
 #define MSG_DELTA_CALIBRATE                 "Делта Калибровка"
 #define MSG_DELTA_CALIBRATE_X               "Калибровка X"
 #define MSG_DELTA_CALIBRATE_Y               "Калибровка Y"
 #define MSG_DELTA_CALIBRATE_Z               "Калибровка Z"
 #define MSG_DELTA_CALIBRATE_CENTER          "Калибровка Център"
 
+#define MSG_INFO_MENU                       "About Printer"
+#define MSG_INFO_PRINTER_MENU               "Printer Info"
+#define MSG_INFO_STATS_MENU                 "Printer Stats"
+#define MSG_INFO_BOARD_MENU                 "Board Info"
+#define MSG_INFO_THERMISTOR_MENU            "Thermistors"
+#define MSG_INFO_EXTRUDERS                  "Extruders"
+#define MSG_INFO_BAUDRATE                   "Baud"
+#define MSG_INFO_PROTOCOL                   "Protocol"
+#define MSG_LIGHTS_ON                       "Case light on"
+#define MSG_LIGHTS_OFF                      "Case light off"
+
+#if LCD_WIDTH >= 20
+  #define MSG_INFO_PRINT_COUNT              "Print Count"
+  #define MSG_INFO_COMPLETED_PRINTS         "Completed"
+  #define MSG_INFO_PRINT_TIME               "Total print time"
+  #define MSG_INFO_PRINT_LONGEST            "Longest job time"
+  #define MSG_INFO_PRINT_FILAMENT           "Extruded total"
+#else
+  #define MSG_INFO_PRINT_COUNT              "Prints"
+  #define MSG_INFO_COMPLETED_PRINTS         "Completed"
+  #define MSG_INFO_PRINT_TIME               "Total"
+  #define MSG_INFO_PRINT_LONGEST            "Longest"
+  #define MSG_INFO_PRINT_FILAMENT           "Extruded"
+#endif
+
+#define MSG_INFO_MIN_TEMP                   "Min Temp"
+#define MSG_INFO_MAX_TEMP                   "Max Temp"
+#define MSG_INFO_PSU                        "Power Supply"
+
+#define MSG_DRIVE_STRENGTH                  "Drive Strength"
+#define MSG_DAC_PERCENT                     "Driver %"
+#define MSG_DAC_EEPROM_WRITE                "DAC EEPROM Write"
+#define MSG_FILAMENT_CHANGE_HEADER          "CHANGE FILAMENT"
+#define MSG_FILAMENT_CHANGE_OPTION_HEADER   "CHANGE OPTIONS:"
+#define MSG_FILAMENT_CHANGE_OPTION_EXTRUDE  "Extrude more"
+#define MSG_FILAMENT_CHANGE_OPTION_RESUME   "Resume print"
+#if LCD_HEIGHT >= 4
+  #define MSG_FILAMENT_CHANGE_INIT_1          "Wait for start"
+  #define MSG_FILAMENT_CHANGE_INIT_2          "of the filament"
+  #define MSG_FILAMENT_CHANGE_INIT_3          "change"
+  #define MSG_FILAMENT_CHANGE_UNLOAD_1        "Wait for"
+  #define MSG_FILAMENT_CHANGE_UNLOAD_2        "filament unload"
+  #define MSG_FILAMENT_CHANGE_UNLOAD_3        ""
+  #define MSG_FILAMENT_CHANGE_INSERT_1        "Insert filament"
+  #define MSG_FILAMENT_CHANGE_INSERT_2        "and press button"
+  #define MSG_FILAMENT_CHANGE_INSERT_3        "to continue..."
+  #define MSG_FILAMENT_CHANGE_LOAD_1          "Wait for"
+  #define MSG_FILAMENT_CHANGE_LOAD_2          "filament load"
+  #define MSG_FILAMENT_CHANGE_LOAD_3          ""
+  #define MSG_FILAMENT_CHANGE_EXTRUDE_1       "Wait for"
+  #define MSG_FILAMENT_CHANGE_EXTRUDE_2       "filament extrude"
+  #define MSG_FILAMENT_CHANGE_EXTRUDE_3       ""
+  #define MSG_FILAMENT_CHANGE_RESUME_1        "Wait for print"
+  #define MSG_FILAMENT_CHANGE_RESUME_2        "to resume"
+  #define MSG_FILAMENT_CHANGE_RESUME_3        ""
+#else // LCD_HEIGHT < 4
+  #define MSG_FILAMENT_CHANGE_INIT_1          "Please wait..."
+  #define MSG_FILAMENT_CHANGE_UNLOAD_1        "Ejecting..."
+  #define MSG_FILAMENT_CHANGE_INSERT_1        "Insert and Click"
+  #define MSG_FILAMENT_CHANGE_LOAD_1          "Loading..."
+  #define MSG_FILAMENT_CHANGE_EXTRUDE_1       "Extruding..."
+  #define MSG_FILAMENT_CHANGE_RESUME_1        "Resuming..."
+#endif // LCD_HEIGHT < 4
+
 #endif // LANGUAGE_BG_H