diff -r 3cee4d5a0c29 -r a8723fffbaf6 src/pyams_content/shared/site/zmi/container.py
--- a/src/pyams_content/shared/site/zmi/container.py	Wed Sep 19 10:49:26 2018 +0200
+++ b/src/pyams_content/shared/site/zmi/container.py	Wed Sep 19 10:54:08 2018 +0200
@@ -332,9 +332,10 @@
                     icon_class = 'fa-eye opacity-75'
                 else:
                     icon_class = 'fa-eye-slash text-danger opaque'
-            return '<i class="fa fa-fw {icon_class} hint align-base" title="{title}" data-ams-hint-gravity="e"></i>'.format(
-                icon_class=icon_class,
-                title=self.request.localizer.translate(self.get_icon_hint(item)))
+            return '<i class="fa fa-fw {icon_class} hint align-base" title="{title}" ' \
+                   'data-ams-hint-gravity="e"></i>'.format(
+                    icon_class=icon_class,
+                    title=self.request.localizer.translate(self.get_icon_hint(item)))
 
     def get_icon_hint(self, item):
         translate = self.request.localizer.translate
@@ -393,12 +394,12 @@
                '        <i class="fa fa-fw {switch}"></i>' \
                '    </span>&nbsp;&nbsp;<span class="title">{title}</span>' \
                '</div>'.format(
-                   padding='<span class="tree-node-padding"></span>' * depth,
-                   hint=self.request.localizer.translate(_("Click to show/hide inner folders")),
-                   switch='fa-{state}-square-o switch'.format(
-                       state=self.table.rows_state or ('minus' if item in lineage(self.context) else 'plus'))
-                           if ISiteContainer.providedBy(item) else '',
-                   title=name or super(SiteContainerTreeNameColumn, self).renderCell(item))
+                padding='<span class="tree-node-padding"></span>' * depth,
+                hint=self.request.localizer.translate(_("Click to show/hide inner folders")),
+                switch='fa-{state}-square-o switch'.format(
+                    state=self.table.rows_state or ('minus' if item in lineage(self.context) else 'plus'))
+                if ISiteContainer.providedBy(item) else '',
+                title=name or super(SiteContainerTreeNameColumn, self).renderCell(item))
 
 
 @adapter_config(name='content-type', context=(ISiteContainer, IPyAMSLayer, ISiteTreeTable), provides=IColumn)