Add backslash and comment

languages/de_mac.json

@@ -9,7 +9,7 @@
   "7": "00,00,24",
   "8": "00,00,25",
   "9": "00,00,26",
-  "__comment": "German umlauts added by Simon Dankelmann",
+  "__comment": "A mac's default Germany keyboard layout",
   "a": "00,00,04",
   "b": "00,00,05",
   "c": "00,00,06",
@@ -143,7 +143,7 @@
   "@": "40,00,0f",
   "[": "40,00,22",
   "]": "40,00,23",
-  "\\": "40,02,24",
+  "\\": "42,00,24",
   "|": "40,00,24",
   "{": "40,00,25",
   "}": "40,00,26",
@@ -159,4 +159,4 @@
   "Ä": "02,00,34",
   "Ö": "02,00,33",
   "Ü": "02,00,2f"
-}
+}