Implement option to replace existing alias when renaming an account; use database transactions when editing accounts

templates/account_details.html.twig

@@ -73,8 +73,8 @@
             </tr>
             {% for alias in aliases %}
                 <tr>
-                    <td>{{ alias['mail_address'] }}</td>
-                    <td>{{ alias['created_at'] }}</td>
+                    <td>{{ alias.getMailAddress() }}</td>
+                    <td>{{ alias.getCreatedAt() | date }}</td>
                     <td><a href="#">Delete</a></td> {# TODO #}
                 </tr>
             {% endfor %}