[FEAT] Adding loader for documents and journals. But how to stop it ?

templates/corpus/documents.html

@@ -67,6 +67,14 @@ th a {
         <div class="row">
             <div id="monthly-volume-chart"></div>
         </div>
+        
+        <div id="content_loader">
+          <br>
+          <center>
+            <img width="10%" src="{% static "img/ajax-loader.gif"%}"></img>
+          </center>
+          <br>
+        </div>
 
     </div>
 </div>

templates/corpus/journals.html

@@ -133,7 +133,13 @@ input[type=radio]:checked + label {
         <div class="row">
             <div id="monthly-volume-chart"></div>
         </div>
-
+        <div id="content_loader">
+          <br>
+          <center>
+            <img width="10%" src="{% static "img/ajax-loader.gif"%}"></img>
+          </center>
+          <br>
+        </div>
     </div>
 </div>