Added twig extension to format file size, links to download and delete files attached to the book.

templates/book/show.html.twig

@@ -50,10 +50,10 @@
             <tr>
                 <td>{{ file.id }}</td>
                 <td>{{ file.fileName }}</td>
-                <td>{{ file.fileSize }}</td>
+                <td>{{ file.fileSize | bytes_format }}</td>
                 <td>{{ file.extension }}</td>
-                <td>download</td>
-                <td>remove</td>
+                <td><a href="{{ path('app_file_download', {id: file.id }) }}" class="link-secondary">download</a></td>
+                <td><a href="{{ path('app_file_delete', {id: file.id}) }}" class="link-danger">remove</a></td>
             </tr>
         {% else %}
             <tr>