When using urlalias_iri I can create an object with umlaut on its name from the backend, but can't edit it.

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. Edit the folder you created on step 2

You will get this error:

The requested page could not be displayed. (20)

The requested address or module could not be found.

Possible reasons:

The address was misspelled. Try changing the URL.
The name of the module was misspelled. Try changing the URL.
There is no <Folder_with_C3_B6_on_it> module available on this site.
The site is using URL matching to determine which siteaccess to use, but the name of the siteaccess is missing from the URL. Try to add the name of the siteaccess; it should be specified before the name of the module.