Add currencies (#434)

* Prepare currencies for PL, RO and NZ

* Populate product-currencies and update relevant markets

* Add currencies

* Fix migration version before merge

migrations/000.510.sql

@@ -0,0 +1,13 @@
+INSERT INTO "i18n-currencies" (
+    iso3char,
+    symbol,
+    fractional_parts,
+    locale
+)
+VALUES ('PLN', 'zł', 0, 'pl_PL.UTF-8'),
+       ('RON', 'lei', 0, 'ro_RO.UTF-8')
+    ON CONFLICT(iso3char) DO NOTHING;
+
+INSERT INTO "product-currencies" (iso3char, exchange_rate)
+VALUES ('RON', 1)
+    ON CONFLICT(iso3char) DO NOTHING;