upgraded to symfony 4 #74 (#81)

templates/bundles/TwigBundle/Exception/error.html.twig

@@ -0,0 +1,28 @@
+{#
+    This template is used to render any error different from 403, 404 and 500.
+
+    This is the simplest way to customize error pages in Symfony applications.
+    In case you need it, you can also hook into the internal exception handling
+    made by Symfony. This allows you to perform advanced tasks and even recover
+    your application from some errors.
+    See http://symfony.com/doc/current/cookbook/controller/error_pages.html
+#}
+
+{% extends 'base.html.twig' %}
+
+{% block body_id 'error' %}
+
+{% block main %}
+    <h1 class="text-danger">{{ 'http_error.name'|trans({ '%status_code%': status_code }) }}</h1>
+
+    <p class="lead">
+        {{ 'http_error.description'|trans({ '%status_code%': status_code }) }}
+    </p>
+    <p>
+        {{ 'http_error.suggestion'|trans({ '%url%': path('homepage') })|raw }}
+    </p>
+{% endblock %}
+
+{% block sidebar %}
+    {{ parent() }}
+{% endblock %}