Php string missing

[jeremymatter]

the file donation-form.php which displays the donation form does contain plain text instead of a translatable php string with a text-domain

<form method="post">
    <table>
        <tr>
            <td>__( 'Donation Project', WC_QD_TXT )</td>
            <td> <?php echo $donation_box; ?></td>
        </tr>
        <tr>
            <td>__( 'Donation Amount', WC_QD_TXT ) <?php echo $currency; ?></td>
            <td><?php echo $donation_price; ?></td>
        </tr>
        <tr>
            <td></td>
            <td><input type="submit" name="donation_add" value="__( 'Add Donation', WC_QD_TXT )"/></td>
        </tr>
    </table>
</form>