Actualización

vendor/sonata-project/admin-bundle/Resources/views/CRUD/select_subclass.html.twig

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+{#
+
+This file is part of the Sonata package.
+
+(c) Thomas Rabaix <thomas.rabaix@sonata-project.org>
+
+For the full copyright and license information, please view the LICENSE
+file that was distributed with this source code.
+
+#}
+{% extends base_template %}
+
+{% block title %}{{ 'title_select_subclass'|trans({}, 'SonataAdminBundle') }}{% endblock %}
+
+{% block content %}
+    <div class="box box-success">
+        <div class="box-header">
+            <h3 class="box-title">
+                {{ block('title') }}
+            </h3>
+        </div>
+        <div class="box-body">
+            {% for subclass in admin.subclasses|keys %}
+                <div class="col-lg-2 col-md-3 col-sm-4 col-xs-6">
+                    <a href="{{ admin.generateUrl(action, {'subclass': subclass }) }}"
+                       class="btn btn-app btn-block"
+                            >
+                        <i class="fa fa-plus-square" aria-hidden="true"></i>
+                        {{ subclass|trans({}, admin.translationdomain|default('SonataAdminBundle')) }}
+                    </a>
+                </div>
+            {% else %}
+                <span class="alert alert-info">{{ 'no_subclass_available'|trans({}, 'SonataAdminBundle') }}</span>
+            {% endfor %}
+            <div class="clearfix"></div>
+        </div>
+    </div>
+{% endblock %}