For Quickr 8.1 you should make sure that you have set the option "Internet Protocols -> Domino Web Engine -> Use UTF-8 for output" to "Yes" in the server document of the Domino server.
Otherwise you might observe several issues e.g.
- Error "Invalid URL exception" when clicking the option "Check out and Edit" in the context menue of a document if this document was created by a user which contains a German special character in his user name.
- Same problem as above if the titel of the document contains German special characters.
- Document title not displayed correctly in the folder view if title contains German special characters (e.g. "L?gen" instead of "Lösungen")
This might happen with special characters of other languages as well.