add popover on download history button

debomatic-webui/public/javascripts/page_history.js

@@ -342,6 +342,8 @@ function Page_History() {
         socket.emit(config.events.client.disk_usage);
     };
 
+    // active downlaod tooltip
+    $("[data-toggle='popover']").popover();
     $('#download').on('click', function () {
         _exportTableToCSV.apply(this, [$('#history'), 'history.csv']);
     });

debomatic-webui/views/history.ejs

@@ -23,7 +23,7 @@
         </div>
     </div>
     <div class="body" style="display: none">
-        <a id="download" class="btn btn-primary">Download current view</a>
+        <a id="download" class="btn btn-primary" data-trigger="hover" data-toggle="popover" title="Export to CSV" data-placement="right" data-content="Save the packages displaied in the table in format CSV. You can filter out packages by selecting distributions, a status, specifying a date or an uploader.">Download current view</a>
         <table id="history" class="tablesorter">
             <thead>
                 <tr>