Added missing space after icon in list for boolean type.

Resources/views/CRUD/list_boolean.html.twig

@@ -27,10 +27,10 @@ file that was distributed with this source code.
     {% endif %}
 {% else %}
     {% if value %}
-        <i class="icon-ok-circle"></i>
+        <i class="icon-ok-circle">&nbsp;
         {%- trans from 'SonataAdminBundle' %}label_type_yes{% endtrans -%}
     {% else %}
-        <i class="icon-ban-circle"></i>
+        <i class="icon-ban-circle"></i>&nbsp;
         {%- trans from 'SonataAdminBundle' %}label_type_no{% endtrans -%}
     {% endif %}
 {% endif %}