install twig intl-extra, replace localizeddate filter by format_date

Resources/views/Person/view.html.twig

@@ -88,7 +88,7 @@ This view should receive those arguments:
                 <dt>{{ 'Date of birth'|trans }}&nbsp;:</dt>
                 <dd>
                     {%- if person.birthdate is not null -%}
-                    {{ person.birthdate|localizeddate('long', 'none') }}
+                    {{ person.birthdate|format_date('long', 'none') }}
                     {%- else -%}
                     <span class="chill-no-data-statement">{{ 'Unknown date of birth'|trans }}</span>
                     {%- endif -%}