Add postalcode translation

config/locales/client.en.yml

@@ -161,6 +161,7 @@ en:
         neighbourhood: "Please enter a neighbourhood."
         city: "Please enter a city, town or village."
         street: "Please enter a Number and Street."
+        postalcode: "Please enter a Postal Code (Zip)."
         countrycode: "Please select a country."
         geo_location: "Search and select a result."