Add email contact

wiki/src/donate.html

@@ -623,6 +623,12 @@ permitted by law.</strong></p>
     </p>
   </div>
 
+  <div class="col-md-5">
+    <h4 id="contact">Contact</h4>
+    <p>If you have any question or problem regarding your donation, our fundraising team is here to help you:</p>
+    <p><a href="mailto:tails-fundraising@boum.org">tails-fundraising@boum.org</a></p>
+  </div>
+
 </div> <!-- .row -->
 
 <div id="other-ways-3" class="row">