make default statistics 0

frontend/www/statistics.html

@@ -33,15 +33,15 @@
       <div class="centering">
         <div class="list-group list-group-horizontal d-inline-flex mt-2">
           <div class="number">
-            <h1 id="week">Last seven days</h1>
+            <h1 id="week">0</h1>
             <p>Last seven days</p>
           </div>
           <div class="number">
-            <h1 id="month">Last thirty days</h1>
+            <h1 id="month">0</h1>
             <p>Last 30 days</p>
           </div>
           <div class="number">
-            <h1 id="year">Last 365 days</h1>
+            <h1 id="year">0</h1>
             <p>Last 365 days</p>
           </div>
         </div>