[FIX][help_online] Manage type conversion

See https://github.com/OCA/web/pull/584#discussion_r106707896

help_online/tests/common.py

@@ -81,7 +81,7 @@ class TestWizardCommon(object):
             'type': 'qweb',
             'arch': arch,
             'page': True,
-            'key': 'website.' + pageName
+            'key': 'website.%s' % pageName
         }
         view_id = self.env['ir.ui.view'].create(vals)
         return view_id.id