Dev: issue #11902: Array dual scale: 2 x no answer

Dev: the now answer header is for no-js

application/views/survey/questions/arrays/dualscale/answer_header.php

@@ -17,7 +17,7 @@
     <?php endforeach; ?>
     <?php if (count($labelans1) > 0): ?>
         <td class="header_separator"><?php if ($shownoanswer): ?>
-        <?php eT('No answer'); ?>
+        <div class="ls-js-hidden"><?php eT('No answer'); ?></div>
         <?php endif; ?></td>  <!-- Separator : and No answer for accessibility for first colgroup -->
         <?php foreach ($labelans1 as $ld): ?>
             <th  class=''><?php echo $ld; ?></th>