Merge 'Ultimaker' (PR#2331)

Marlin/language.h

 
 #if MB(ULTIMAKER)|| MB(ULTIMAKER_OLD)|| MB(ULTIMAIN_2)
   #define MACHINE_NAME "Ultimaker"
-  #define SOURCE_CODE_URL "http://firmware.ultimaker.com"
+  #define SOURCE_CODE_URL "https://github.com/Ultimaker/Marlin"
 #elif MB(RUMBA)
   #define MACHINE_NAME "Rumba"
 #elif MB(3DRAG)

Marlin/language_nl.h

 #define MSG_DWELL                           "Slapen..."
 #define MSG_USERWAIT                        "Wachten..."
 #define MSG_RESUMING                        "Print hervatten"
-#define MSG_PRINT_ABORTED                   "Print aborted"
+#define MSG_PRINT_ABORTED                   "Print afgebroken"
 #define MSG_NO_MOVE                         "Geen beweging."
 #define MSG_KILLED                          "AFGEBROKEN. "
 #define MSG_STOPPED                         "GESTOPT. "
 #define MSG_END_MINUTE                      "minutes"
 
 #ifdef DELTA_CALIBRATION_MENU
-    #define MSG_DELTA_CALIBRATE             "Delta Calibration"
-    #define MSG_DELTA_CALIBRATE_X           "Calibrate X"
-    #define MSG_DELTA_CALIBRATE_Y           "Calibrate Y"
-    #define MSG_DELTA_CALIBRATE_Z           "Calibrate Z"
-    #define MSG_DELTA_CALIBRATE_CENTER      "Calibrate Center"
+    #define MSG_DELTA_CALIBRATE             "Delta Calibratie"
+    #define MSG_DELTA_CALIBRATE_X           "Kalibreer X"
+    #define MSG_DELTA_CALIBRATE_Y           "Kalibreer Y"
+    #define MSG_DELTA_CALIBRATE_Z           "Kalibreer Z"
+    #define MSG_DELTA_CALIBRATE_CENTER      "Kalibreer Midden"
 #endif // DELTA_CALIBRATION_MENU
 
 #endif // LANGUAGE_NL_H