New dialogs translated to spanish. Bug fixes.

Dialogs from M119 translated, and "Set Preheat" dialogs adapted to the
screen size.

Marlin/language.h

 #define MSG_SET_ORIGIN " Establecer Cero"
 #define MSG_COOLDOWN " Enfriar"
 #define MSG_EXTRUDE " Extruir"
-#define MSG_RETRACT " Retract"
+#define MSG_RETRACT " Retraer"
 #define MSG_PREHEAT_PLA " Precalentar PLA"
-#define MSG_PREHEAT_PLA_SETTINGS " Precalentar PLA Setting"
+#define MSG_PREHEAT_PLA_SETTINGS " Ajustar temp. PLA"
 #define MSG_PREHEAT_ABS " Precalentar ABS"
-#define MSG_PREHEAT_ABS_SETTINGS " Precalentar ABS Setting"
+#define MSG_PREHEAT_ABS_SETTINGS " Ajustar temp. ABS"
 #define MSG_MOVE_AXIS " Mover Ejes      \x7E"
 #define MSG_SPEED " Velocidad:"
 #define MSG_NOZZLE " \002Nozzle:"
 #define MSG_Y_MIN "y_min: "
 #define MSG_Y_MAX "y_max: "
 #define MSG_Z_MIN "z_min: "
-#define MSG_M119_REPORT "Reporting endstop status"
-#define MSG_ENDSTOP_HIT "TRIGGERED"
-#define MSG_ENDSTOP_OPEN "open"
+#define MSG_M119_REPORT "Comprobando fines de carrera."
+#define MSG_ENDSTOP_HIT "PULSADO"
+#define MSG_ENDSTOP_OPEN "abierto"
         
 #define MSG_SD_CANT_OPEN_SUBDIR "No se pudo abrir la subcarpeta."
 #define MSG_SD_INIT_FAIL "Fallo al iniciar la SD"