Support longer print times in M31

Marlin/Marlin_main.cpp

  */
 inline void gcode_M31() {
   millis_t t = print_job_timer.duration();
-  int min = t / 60, sec = t % 60;
-  char time[30];
-  sprintf_P(time, PSTR("%i min, %i sec"), min, sec);
+  int d = int(t / 60 / 60 / 24),
+      h = int(t / 60 / 60) % 60,
+      m = int(t / 60) % 60,
+      s = int(t % 60);
+  char time[18];                                          // 123456789012345678
+  if (d)
+    sprintf_P(time, PSTR("%id %ih %im %is"), d, h, m, s); // 99d 23h 59m 59s
+  else
+    sprintf_P(time, PSTR("%ih %im %is"), h, m, s);        // 23h 59m 59s
+
+  lcd_setstatus(time);
+
   SERIAL_ECHO_START;
+  SERIAL_ECHOPGM(MSG_PRINT_TIME " ");
   SERIAL_ECHOLN(time);
-  lcd_setstatus(time);
+
   thermalManager.autotempShutdown();
 }
 

Marlin/language_en.h

 #ifndef MSG_PLEASE_RESET
   #define MSG_PLEASE_RESET                    "Please reset"
 #endif
+#ifndef MSG_END_DAY
+  #define MSG_END_DAY                         "days"
+#endif
 #ifndef MSG_END_HOUR
   #define MSG_END_HOUR                        "hours"
 #endif
 #ifndef MSG_END_MINUTE
   #define MSG_END_MINUTE                      "minutes"
 #endif
+#ifndef MSG_PRINT_TIME
+  #define MSG_PRINT_TIME                      "Print time"
+#endif
 #ifndef MSG_HEATING
   #define MSG_HEATING                         "Heating..."
 #endif
 #ifndef MSG_DELTA_CALIBRATE_CENTER
   #define MSG_DELTA_CALIBRATE_CENTER          "Calibrate Center"
 #endif
+
 #ifndef MSG_INFO_MENU
   #define MSG_INFO_MENU                       "About Printer"
 #endif