Merge M11 fixes (PR#2394)

Marlin/Marlin.h

 #define SERIAL_PROTOCOL(x) MYSERIAL.print(x)
 #define SERIAL_PROTOCOL_F(x,y) MYSERIAL.print(x,y)
 #define SERIAL_PROTOCOLPGM(x) serialprintPGM(PSTR(x))
-#define SERIAL_PROTOCOLLN(x) do{ MYSERIAL.print(x),MYSERIAL.write('\n'); }while(0)
-#define SERIAL_PROTOCOLLNPGM(x) do{ serialprintPGM(PSTR(x)),MYSERIAL.write('\n'); }while(0)
+#define SERIAL_PROTOCOLLN(x) do{ MYSERIAL.print(x); SERIAL_EOL; }while(0)
+#define SERIAL_PROTOCOLLNPGM(x) do{ serialprintPGM(PSTR(x)); SERIAL_EOL; }while(0)
 
 
 extern const char errormagic[] PROGMEM;

Marlin/Marlin_main.cpp

 inline void gcode_M111() {
   marlin_debug_flags = code_seen('S') ? code_value_short() : DEBUG_INFO|DEBUG_COMMUNICATION;
   
-  SERIAL_ECHO_START;
-  if (marlin_debug_flags & DEBUG_ECHO) SERIAL_ECHOLNPGM(MSG_DEBUG_ECHO);
+  if (marlin_debug_flags & DEBUG_ECHO) {
+    SERIAL_ECHO_START;
+    SERIAL_ECHOLNPGM(MSG_DEBUG_ECHO);
+  }
   // FOR MOMENT NOT ACTIVE
   //if (marlin_debug_flags & DEBUG_INFO) SERIAL_ECHOLNPGM(MSG_DEBUG_INFO);
   //if (marlin_debug_flags & DEBUG_ERRORS) SERIAL_ECHOLNPGM(MSG_DEBUG_ERRORS);
   if (marlin_debug_flags & DEBUG_DRYRUN) {
+    SERIAL_ECHO_START;
     SERIAL_ECHOLNPGM(MSG_DEBUG_DRYRUN);
-    setTargetBed(0);
-    for (int8_t cur_hotend = 0; cur_hotend < EXTRUDERS; ++cur_hotend) {
-      setTargetHotend(0, cur_hotend);
-    }
+    disable_all_heaters();
   }
 }
 

Marlin/configurator/config/language.h

 #define MSG_KP                              " Kp: "
 #define MSG_KI                              " Ki: "
 #define MSG_KD                              " Kd: "
-#define MSG_OK_B                            "ok B:"
-#define MSG_OK_T                            "ok T:"
 #define MSG_AT                              " @:"
 #define MSG_PID_AUTOTUNE_FINISHED           MSG_PID_AUTOTUNE " finished! Put the last Kp, Ki and Kd constants from below into Configuration.h"
 #define MSG_PID_DEBUG                       " PID_DEBUG "