FIX: remove curly bracket left behind on PR 7488 (django-cms#7529)

see this comment for more infos: https://github.com/django-cms/django-cms/pull/7488\#issuecomment-1513517082

cms/templates/admin/cms/page/tree/actions_dropdown.html

@@ -105,7 +105,7 @@
             <p title="{% filter escapejs %}{% trans "last change by" %}{% endfilter %}: {{ page.changed_by }}"><strong>{% trans "last change by" %}:</strong> {{ page.changed_by }}</p>
         {% endif %}
         {% if page.changed_date %}
-            <p title="{% filter escapejs %}{% trans "last change on" %}{% endfilter %}: {{ page.changed_date|date:"Y-m-d H:i:s" }}"><strong>{{% trans "last change on" %}:</strong> {{ page.changed_date|date:"Y-m-d H:i:s" }}</p>
+            <p title="{% filter escapejs %}{% trans "last change on" %}{% endfilter %}: {{ page.changed_date|date:"Y-m-d H:i:s" }}"><strong>{% trans "last change on" %}:</strong> {{ page.changed_date|date:"Y-m-d H:i:s" }}</p>
         {% endif %}
         {% if page.get_template_display %}
             <p title="{% filter escapejs %}{% trans "template" %}{% endfilter %}: {{ page.get_template_display }}"><strong>{% trans "template" %}:</strong> {{ page.get_template_display }}</p>