+<input id="contribconfirm" name="contribconfirm" value="${mpx[contribconfirm]}" placeholder="$(l10n contribconfirm)">
+<input type="checkbox" id="contribreceipt" name="contribreceipt" value="true" ${mpx[contribreceipt]:+checked}>
+<label for="contribreceipt">$(l10n contribreceipt)</label>