Remove MSG_PRINT_TIME from languages

Marlin/language_en.h

 #ifndef MSG_SHORT_MINUTE
   #define MSG_SHORT_MINUTE                    "m" // One character only
 #endif
-#ifndef MSG_PRINT_TIME
-  #define MSG_PRINT_TIME                      "Print time"
-#endif
 #ifndef MSG_HEATING
   #define MSG_HEATING                         "Heating..."
 #endif

Marlin/language_it.h

 #define MSG_SHORT_DAY                       "g" // One character only
 #define MSG_SHORT_HOUR                      "h" // One character only
 #define MSG_SHORT_MINUTE                    "m" // One character only
-#define MSG_PRINT_TIME                      "Durata stampa"
 #define MSG_HEATING                         "Riscaldamento.."
 #define MSG_HEATING_COMPLETE                "Risc. completato"
 #define MSG_BED_HEATING                     "Risc. Piatto.."

Marlin/language_kana.h

 #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_PRINT_TIME                      "\xcc\xdf\xd8\xdd\xc4\xbc\xde\xb6\xdd"                             // "ﾌﾟﾘﾝﾄｼﾞｶﾝ" ("Print time")
 #define MSG_HEATING                         "\xb6\xc8\xc2\xc1\xad\xb3"                                         // "ｶﾈﾂﾁｭｳ" ("Heating...")
 #define MSG_HEATING_COMPLETE                "\xb6\xc8\xc2\xb6\xdd\xd8\xae\xb3"                                 // "ｶﾈﾂｶﾝﾘｮｳ" ("Heating done.")
 #define MSG_BED_HEATING                     "\xcd\xde\xaf\xc4\xde\x20\xb6\xc8\xc2\xc1\xad\xb3"                 // "ﾍﾞｯﾄﾞ ｶﾈﾂﾁｭｳ" ("Bed Heating.")

Marlin/language_kana_utf8.h

 #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_PRINT_TIME                      "プリントジカン"                  // "Print time"
 #define MSG_HEATING                         "カネツチュウ"                   // "Heating..."
 #define MSG_HEATING_COMPLETE                "カネツカンリョウ"                 // "Heating done."
 #define MSG_BED_HEATING                     "ベッド カネツチュウ"              // "Bed Heating."