Añadiendo descripciones dentro de una galería de blueimp

Estoy usando unGalería BlueImp para añadir lightboxes a mi galería de imágenes. Entonces, al hacer clic en la miniatura de una imagen, se inicia una caja de luz con una versión más grande de la imagen, etc.

También quiero agregar un texto descriptivo y un botón a cada diapositiva de la caja de luz, pero tengo problemas para hacer que funcione. No mostrará las descripciones de los marcadores de posición que he agregado.

Esto es lo que tengo hasta ahora;

HTML:

<div id="blueimp-gallery" class="blueimp-gallery">
    <!-- The container for the modal slides -->
    <div class="slides"></div>
    <!-- Controls for the borderless lightbox -->
    <h3 class="title"></h3>
    <p class="description"></p>
    <a class="prev">‹</a>
    <a class="next">›</a>
    <a class="close">×</a>
    <a class="play-pause"></a>
    <ol class="indicator"></ol>

    <div class="modal fade">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" aria-hidden="true">&times;</button>
                    <h4 class="modal-title"></h4>
                </div>
                <div class="modal-body next"></div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default pull-left prev">
                        <i class="glyphicon glyphicon-chevron-left"></i>
                        Previous
                    </button>
                    <button type="button" class="btn btn-primary next">
                        Next
                        <i class="glyphicon glyphicon-chevron-right"></i>
                    </button>
                </div>
            </div>
        </div>
    </div>
</div>

<div id="links">

<div class="row prints">
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">
        <a href="http://farm3.staticflickr.com/2843/10406026526_4cd1b56391.jpg" title="Ballooning" data-description="This is a banana." data-gallery>
          <img src="http://farm8.staticflickr.com/7389/10404414563_0914b69e0e.jpg" alt="Ballooning">
        </a>
        <h3>Ballooning</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>  
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">  
        <a href="http://farm6.staticflickr.com/5547/10406009404_c197c2221b.jpg" title="Clearing" data-description="This is a apple." data-gallery>
            <img src="http://farm6.staticflickr.com/5490/10404414523_745ea3065d.jpg" alt="Clearing">
        </a> 
        <h3>Clearing</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">              
        <a href="http://farm6.staticflickr.com/5510/10406026066_7f95a075ee.jpg" title="Sky/Sea" data-description="This is a cherry." data-gallery>
            <img src="http://farm4.staticflickr.com/3769/10404249505_d767f7c420.jpg" alt="Sky/Sea">
        </a>
        <h3>Sky/Sea</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>  
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">          
        <a href="http://farm4.staticflickr.com/3678/10406009004_5c625e2028.jpg" title="Lights" data-description="This is a grapefruit." data-gallery>
            <img src="http://farm3.staticflickr.com/2814/10404249395_9e4cae5bc7.jpg" alt="Lights">
        </a>
        <h3>Lights</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>  
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">          
        <a href="http://farm6.staticflickr.com/5538/10406019875_8424fbee11.jpg" title="Silhouettes" data-description="This is a orange." data-gallery>
            <img src="http://farm8.staticflickr.com/7343/10404255766_d808d1902d.jpg" alt="Silhouettes">
        </a>
        <h3>Silhouettes</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>   
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">         
        <a href="http://farm4.staticflickr.com/3682/10406009134_3b666324ff.jpg" title="Sway" data-description="This is a kiwi." data-gallery>
            <img src="http://farm6.staticflickr.com/5516/10404249545_7efb481042.jpg" alt="Sway">
        </a>
        <h3>Sway</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>  
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">          
        <a href="http://farm8.staticflickr.com/7425/10406019935_1def1e0c09.jpg" title="Sunset" data-description="This is a grape." data-gallery>
            <img src="http://farm3.staticflickr.com/2810/10404249465_0124b7f3e5.jpg" alt="Sunset">
        </a>
        <h3>Sunset</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>  
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">          
        <a href="http://farm6.staticflickr.com/5532/10406009324_4cd1b56391.jpg" title="Lighthouse" data-description="This is a strawberry." data-gallery>
            <img src="http://farm6.staticflickr.com/5543/10404240054_6261498220.jpg" alt="Lighthouse">
        </a>
        <h3>Lighthouse</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div> 
  <div class="col-md-4">
    <div class="thumbnail">    
      <div class="caption">           
        <a href="http://farm4.staticflickr.com/3747/10406026506_6a4dbf2df0.jpg" title="Slabs"data-description="This is a pineapple." data-gallery>
            <img src="http://farm8.staticflickr.com/7345/10404249655_7512bf6565.jpg" alt="Slabs">
        </a>
        <h3>Slabs</h3>
        <p>from $18.00</p>
        <p><a href="#" class="btn btn-YLP">Find out more</a></p>
      </div>
   </div>
  </div>        
</div>
</div>

CSS:

.blueimp-gallery > .description {
  position: absolute;
  top: 30px;
  left: 15px;
  color: red;
  display: none;
}

.blueimp-gallery-controls > .description {
  display: block;
}

JS:

blueimp.Gallery(
    document.getElementById('links'),
    {
        onslide: function (index, slide) {
            var text = this.list[index].getAttribute('data-description'),
                node = this.container.find('.description');
            node.empty();
            if (text) {
                node[0].appendChild(document.createTextNode(text));
            }
        }
    }
);

Y en mi cuerpo (gallery.js es el archivo donde he agregado el JS anterior):

  <script src="//code.jquery.com/jquery.js"></script>
  <script src="js/bootstrap.min.js"></script>
  <script src="lib/fancybox/jquery.fancybox.js"></script>
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="http://blueimp.github.io/Gallery/js/jquery.blueimp-gallery.min.js"></script>
  <script src="js/bootstrap-image-gallery.min.js"></script>
  <script src="js/gallery.js"></script>

¡Cualquier indicación sobre dónde me he equivocado sería muy apreciada!

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