Overlay: replace code for close button

[thelabeljoyves]

If I am right, replace in overlay and impressum:

<a href="#" class="linkoverlay" onclick="toggleOverlay('impressum'); return false"><img class="overlay-close" src="/static/media/close-white.e5841fce6e3f.png"></a>

with

<a href="#" class="linkoverlayclose overlay-close" onclick="toggleOverlay('impressum'); return false">X</a>

the overlay for the medias (apart of the TV show) is defined as:

<div class=overlayframe>
 <div class="overlay">
          <a href="..." class="linkoverlayclose overlay-close">X</a>
          <a href="" class="overlay-student linkoverlay"></a><span class="overlay-title"></span>
          <div class="overlay-content">
            <div class="overlay-element w-75">
               img, carousel or vimeo
            </div>
          </div>
          <p class="overlay-caption"></p>
          <div class="overlay-description"></div>
        </div>
      </div>