Update topics_en.html

hint from Haeferl

src/views/topics_en.html

@@ -61,10 +61,13 @@ <h2>Cellar streets</h2>
     <img src="../assets/img/icon_public_art.svg" role="presentation" />
   </aside>
   <div>
-    <h2>Public Art</h2>
+    <h2>Public Art / Culture</h2>
     <p>
       Public Art exists in almost every village in Austria, but especially in the bigger cities.
       Documenting this public art also documents the areas approach to art, making these kind of pictures valuable.
+      <br />
+      This topic also comprises the few elements of intangible cultural heritage
+      that can be assigned to just one or a few municipalities.
     </p>
   </div>
 </div>