Monetary units - currency symbol for Namibian Dollar is wrong

The currency symbol for the monetary unit of a Namibian Dollar is wrong: currently it is set to "$", but it should be "N$"

See attached "Proclamation by the President of The Republic of Namibia", section 19 (b)

Quick manual fix can be achieved by editing table "civicrm_currency" and manually changing the "symbol" to read "N$" instead of N$, but obviously this should be corrected in all versions of CiviCRM. The ISO 4217 code "NAD" is however correct.