Update Marlin Firmware URL

Marlin/language.h

@@ -37,13 +37,13 @@
   #define FIRMWARE_URL "http://firmware.ultimaker.com"
 #elif MB(RUMBA)
   #define MACHINE_NAME "Rumba"
-  #define FIRMWARE_URL "https://github.com/ErikZalm/Marlin/"
+  #define FIRMWARE_URL "https://github.com/MarlinFirmware/Marlin"
 #elif MB(3DRAG)
   #define MACHINE_NAME "3Drag"
   #define FIRMWARE_URL "http://3dprint.elettronicain.it/"
 #elif MB(5DPRINT)
   #define MACHINE_NAME "Makibox"
-  #define FIRMWARE_URL "https://github.com/ErikZalm/Marlin/"
+  #define FIRMWARE_URL "https://github.com/MarlinFirmware/Marlin"
 #elif MB(SAV_MKI)
   #define MACHINE_NAME "SAV MkI"
   #define FIRMWARE_URL "https://github.com/fmalpartida/Marlin/tree/SAV-MkI-config"
@@ -55,7 +55,7 @@
   #endif
 
 // Default firmware set to Mendel
-  #define FIRMWARE_URL "https://github.com/ErikZalm/Marlin/"
+  #define FIRMWARE_URL "https://github.com/MarlinFirmware/Marlin"
 #endif