Fix bad file names

src/app/templates/unl2rdf.html

@@ -60,8 +60,8 @@ obj(when(icl>how,com>always,tim<uw,obj>uw),:01)
 
     {% if output['svg'] %}
         <h2> Unl graph </h2>
-        <span class='clickable' onclick="download('graph.svg', 'svg', 'html', 'image/svg+xml')">Download image <i class="fas fa-download" ></i></span><br />
-        <span class='clickable' onclick="download('graph.svg', 'dot', 'text', 'text/plain;charset=utf-8')">Download source <i class="fas fa-download" ></i></span>
+        <span class='clickable' onclick="download('graph.svg', 'svg', 'html', 'image/svg+xml')">Download image (svg)<i class="fas fa-download" ></i></span><br />
+        <span class='clickable' onclick="download('graph.dot', 'dot', 'text', 'text/plain;charset=utf-8')">Download source (dot) <i class="fas fa-download" ></i></span>
         <div id='svg'>
         {{ output['svg'] | safe }}
         </div>