Add ALT tags to images for accessibility. Fixes #2902

web/pgadmin/misc/file_manager/static/js/utility.js

@@ -534,7 +534,7 @@ var getFolderInfo = function(path, file_type) {
 
   // Display an activity indicator.
   $('.fileinfo').find('span.activity').html(
-    '<img src="' + loading_icon_url + '"/>'
+    '<img src="' + loading_icon_url + '" alt="' + gettext("Loading...") + '"/>'
   );
 
   var post_data = {

web/pgadmin/misc/file_manager/templates/file_manager/index.html

@@ -37,7 +37,8 @@
     </div>
     <div class="fileinfo">
         <span class="activity">
-          <img src="{{ url_for('static', filename='js/generated/img/load-root.gif') }}">
+          <img src="{{ url_for('static', filename='js/generated/img/load-root.gif') }}"
+               alt="{{ _('Loading...') }}">
         </span>
         <div class="file_listing"></div>
         <div class="upload_file dropzone"></div>