fix(cash): use semicolons to enable CSV export

This commit fixes a bug in the cash payment registry CSV export caused
by a description that used commas to join lists of invoices together.
By updating to semicolons, this has been fixed.  However, we may wish to
allow a user to change the delimiter of a CSV export file in case as
user-made description breaks the export.

client/src/js/services/CashService.js

@@ -83,7 +83,8 @@ function CashService(Modal, Api, Exchange, Session, moment, $translate) {
       return invoice.reference;
     });
 
-    var referencesString = invoicesReferences.join(', ');
+    // this must be semicolons, otherwise the CSV file breaks.
+    var referencesString = invoicesReferences.join('; ');
 
     var tmpl = isCaution ? 'CASH.PREPAYMENT_DESCRIPTION' : 'CASH.PAYMENT_DESCRIPTION';