Update list of currencies returned by get_list_of_currencies() and stored in lang/en/currencies.php

Noticed that list of currencies has
$string['SUR'] = 'USSR Rouble';
(and both the country and currency do not exist for 20 years)
but does not have currencies of countries of former USSR:
RUR - Russian Rouble
UAH - Ukraine Hryvnia
Belarus Rouble, etc.

Some other currencies may have changed too over the years