lists: introduce obfuscated formats

app/portal/templates/tables.html.j2

@@ -506,6 +506,7 @@
             <tr>
                 <th scope="col">Provider</th>
                 <th scope="col">Format</th>
+                <th scope="col">Encoding</th>
                 <th scope="col">URI</th>
                 <th scope="col">Description</th>
                 <th scope="col">Actions</th>
@@ -517,6 +518,7 @@
                     <tr class="align-middle">
                         <td>{{ list.provider | provider_name }}</td>
                         <td>{{ list.format | format_name }}</td>
+                        <td>{{ list.encoding | list_encoding_name }}</td>
                         <td><a href="{{ list.url() }}">{{ list.url() }}</a></td>
                         <td>{{ list.description }}</td>
                         <td>