Make accept/decline buttons accessible

src/templates/requesting_contact.html

@@ -7,6 +7,6 @@ JID: {{{jid}}}">{{{fullname}}}</span>
 </a>
 {[ } ]}
 <span class="request-actions">
-    <a class="accept-xmpp-request icon-checkmark" title="{{{desc_accept}}}" href="#"></a>
-    <a class="decline-xmpp-request icon-close" title="{{{desc_decline}}}" href="#"></a>
+    <a class="accept-xmpp-request icon-checkmark" aria-label="{{{desc_accept}}}" title="{{{desc_accept}}}" href="#"></a>
+    <a class="decline-xmpp-request icon-close" aria-label="{{{desc_decline}}}" title="{{{desc_decline}}}" href="#"></a>
 </span>