Fix plurals variable to unblock Translations Pipeline.

    <!-- This is used to express that something occurred within the last X days (e.g., Last 7 days). -->

    <plurals name="last_num_days">

        <item quantity="one">Last <xliff:g id="count">%d</xliff:g> day</item>

        <item quantity="other">Last <xliff:g id="count">%d</xliff:g> days</item>

    </plurals>