Fix little HTML mistakes

backend/templates/base_with_header.html

@@ -4,7 +4,7 @@
     <div class="header-container">
         {% include "title.html" %}
 
-        <span class="header-menu">
+        <div class="header-menu">
             {% include "search.html" %}
 
             <span class="user-menu">
@@ -43,7 +43,7 @@
                 {% endif %} >
                 <span class="slider"></span>
             </label>
-        </span>
+        </div>
     </div>
 
     <div class="main-container">

backend/templates/search.html

@@ -1,6 +1,6 @@
-<span id="search">
+<div id="search">
     <svg class="icon" aria-hidden="true" viewBox="0 0 24 24"><g><path d="M21.53 20.47l-3.66-3.66C19.195 15.24 20 13.214 20 11c0-4.97-4.03-9-9-9s-9 4.03-9 9 4.03 9 9 9c2.215 0 4.24-.804 5.808-2.13l3.66 3.66c.147.146.34.22.53.22s.385-.073.53-.22c.295-.293.295-.767.002-1.06zM3.5 11c0-4.135 3.365-7.5 7.5-7.5s7.5 3.365 7.5 7.5-3.365 7.5-7.5 7.5-7.5-3.365-7.5-7.5z"></path></g></svg>
-    <input type="search" placeholder="{{ context.tr.t(Sentence::SearchPlaceholder) }}" />
+    <input type="search" placeholder="{{ context.tr.t(Sentence::SearchPlaceholder) }}" >
 
     <div class="results">
         <div class="message">
@@ -10,8 +10,10 @@
         <ul>
         </ul>
     </div>
-</span>
+</div>
 
 <div id="hidden-templates-search">
-    <li class="result-item"><a></a></li>
+    <ul>
+        <li class="result-item"><a></a></li>
+    </ul>
 </div>