Add currency "norwegian krones" (#836)

* add: norwegian kroner

Adding the currency of norwegian krones back into the file. There was an earlier commit where this seems to have dropped of the table.

* fix: using the correct terms for the currency.

backend/internal/core/currencies/currencies.json

@@ -623,6 +623,12 @@
     "symbol": "C$",
     "name": "Nicaraguan Córdoba"
   },
+  {
+    "code": "NOK",
+    "local": "Norway",
+    "symbol": "kr",
+    "name": "Norwegian Krone"
+  },
   {
     "code": "UAH",
     "local": "Ukraine",