When using umlaut in the name of an top level object something weird happens on the tree menu creation.

Tree menu will return "Node does not exist", and child objects listing will return "Data error".

Steps to reproduce:
1. Set the follwoing URLTranslator in site.ini

[URLTranslator]
TransformationGroup=urlalias_iri

2. Create a folder (from the backend) under Home with name: Folder with ü on it
3. Try to access the created folder from the backend
The url alias will be wrong, since the title was discarded.

Tree menu will return "Node does not exist", and child objects listing will return "Data error" (see the attached screenshot).