sf4 resolve errors and depreciations

Resources/views/Util/confirmation_template.html.twig

@@ -1,22 +0,0 @@
-{% if title is defined %}
-    <h2>{{ title }}</h2>
-{% endif %}
-
-{% if confirm_question is defined %}
-    <p class="message-confirm">{{ confirm_question }}</p>
-{% endif %}
-
-{{ form_start(form) }}
-
-<ul class="record_actions">
-    <li class="cancel">
-        <a href="{{ path(cancel_route, cancel_parameters|default( { } ) ) }}" class="sc-button bt-cancel">
-            {{ 'Cancel'|trans }}
-        </a>
-    </li>
-    <li>
-        {{ form_widget(form.submit, { 'attr' : { 'class' : "sc-button bt-delete" } } ) }}
-    </li>
-</ul>
-        
-{{ form_end(form) }}