Update language.h

Updated Polish translations.

Marlin/language.h

 	#define WELCOME_MSG MACHINE_NAME " Gotowe."
 	#define MSG_SD_INSERTED "Karta wlozona"
 	#define MSG_SD_REMOVED "Karta usunieta"
-	#define MSG_MAIN "Main"
+	#define MSG_MAIN "Menu glowne"
 	#define MSG_AUTOSTART "Autostart"
 	#define MSG_DISABLE_STEPPERS "Wylacz silniki"
 	#define MSG_AUTO_HOME "Auto. poz. zerowa"
 	#define MSG_PREHEAT_ABS "Rozgrzej ABS"
 	#define MSG_PREHEAT_ABS_SETTINGS "Ustawienia roz. ABS"
 	#define MSG_COOLDOWN "Chlodzenie"
-	#define MSG_SWITCH_PS_ON "Switch Power On"
-	#define MSG_SWITCH_PS_OFF "Switch Power Off"
+	#define MSG_SWITCH_PS_ON "Wl. zasilacz"
+	#define MSG_SWITCH_PS_OFF "Wyl. zasilacz"
 	#define MSG_EXTRUDE "Ekstruzja"
 	#define MSG_RETRACT "Cofanie"
 	#define MSG_MOVE_AXIS "Ruch osi"
 	#define MSG_RECTRACT "Wycofanie"
 	#define MSG_TEMPERATURE "Temperatura"
 	#define MSG_MOTION "Ruch"
-	#define MSG_CONTRAST "LCD contrast"
+	#define MSG_CONTRAST "Kontrast LCD"
 	#define MSG_STORE_EPROM "Zapisz w pamieci"
 	#define MSG_LOAD_EPROM "Wczytaj z pamieci"
-	#define MSG_RESTORE_FAILSAFE " Ustawienia fabryczne"
+	#define MSG_RESTORE_FAILSAFE "Ustawienia fabryczne"
 	#define MSG_REFRESH "\004Odswiez"
-	#define MSG_WATCH "Obserwuj"
+	#define MSG_WATCH "Ekran glowny"
 	#define MSG_PREPARE "Przygotuj"
-	#define MSG_CONTROL "Kontroluj"
+	#define MSG_CONTROL "Ustawienia"
 	#define MSG_TUNE "Strojenie"
 	#define MSG_PAUSE_PRINT "Pauza"
 	#define MSG_RESUME_PRINT "Wznowienie"
 	#define MSG_STOP_PRINT "Stop"
-	#define MSG_CARD_MENU "Menu SDCard"
+	#define MSG_CARD_MENU "Menu karty SD"
 	#define MSG_NO_CARD "Brak karty"
 	#define MSG_DWELL "Uspij..."
 	#define MSG_USERWAIT "Czekaj na uzytkownika..."
 	#define MSG_CONTROL_RETRACT_RECOVER "Cof. wycof. +mm"
 	#define MSG_CONTROL_RETRACT_RECOVERF "Cof. wycof.  F"
 	#define MSG_AUTORETRACT "Auto. wycofanie"
-	#define MSG_FILAMENTCHANGE "Change filament"
-	#define MSG_INIT_SDCARD "Init. SD-Card"	
-	#define MSG_CNG_SDCARD "Change SD-Card"
-    #define MSG_ZPROBE_OUT "ZProbe Outside Bed"
-    #define MSG_POSITION_UNKNOWN "Home X/Y before Z"
+	#define MSG_FILAMENTCHANGE "Zmien filament"
+	#define MSG_INIT_SDCARD "Uruchom karte SD"	
+	#define MSG_CNG_SDCARD "Zmien karte SD"
+    #define MSG_ZPROBE_OUT "Probkuj Z poza lozem"
+    #define MSG_POSITION_UNKNOWN "Domuj X/Y przed Z"
     #define MSG_ZPROBE_ZOFFSET "Z Offset"
 
 // Serial Console Messages
 	#define MSG_BROWNOUT_RESET " Reset (spadek napiecia)"
 	#define MSG_WATCHDOG_RESET " Reset (watchdog)"
 	#define MSG_SOFTWARE_RESET " Reset (programowy)"
-	#define MSG_MARLIN "Marlin "
+	#define MSG_MARLIN "Marlin"
 	#define MSG_AUTHOR " | Autor: "
 	#define MSG_CONFIGURATION_VER " Ostatnia aktualizacja: "
 	#define MSG_FREE_MEMORY " Wolna pamiec: "
 	#define MSG_Z_MIN "z_min: "
 	#define MSG_Z_MAX "z_max: "
 	#define MSG_M119_REPORT "Zgloszenie statusu wylacznikow krancowych"
-	#define MSG_ENDSTOP_HIT "WYZWOLONY"
-	#define MSG_ENDSTOP_OPEN "otwarty"
+	#define MSG_ENDSTOP_HIT "Wyzwolony"
+	#define MSG_ENDSTOP_OPEN "Otwarty"
 	#define MSG_HOTEND_OFFSET "Hotend offsets:"
 
 	#define MSG_SD_CANT_OPEN_SUBDIR "Nie mozna otworzyc podkatalogu"