message: qt [experimental]: Add a translation comment and a disambiguation string
  The goal is to see the way the Transifex presents the added items to
  translators using an intermediate XLIFF translation file.
diff: @@ -309,7 +309,8 @@ void AddressBookPage::on_exportButton_clicked()
  if(!writer.write()) {
  QMessageBox::critical(this, tr("Exporting Failed"),
  - tr("There was an error trying to save the address list to %1. Please try again.").arg(filename));
  + //: %1 is a name of the file (e.g., "addrbook.csv") that the bitcoin addresses were exported to.
  + tr("There was an error trying to save the address list to %1. Please try again.", "An error message.").arg(filename));
  }
  }
  