add section for flash messages in layout template

templates/common/layout.twig

@@ -54,11 +54,11 @@
             {% endblock %}
 
             <div class="content" id="content">
-                {% if message %}
-                <div class="ui message">
-                    {{message}}
-                </div>
-                {% endif %}
+                {% for message in flashMessages %}
+                        <div class="ui message">
+                            {{message[0]}}
+                        </div>
+                {% endfor %}
 
                 {% block content %} {% endblock %}
             </div>