Depending on your server and site settings any non-ASCII character may be expressed URL-encoded instead of their raw UTF-8 representation.
So, the "Visiting this" field should be
geschaeftsdrucksachen-c-1/gesch%C3%A4ftsformulare-p-6 in this case.
However, before doing that, please go to Joomla's Global Configuration, Site tab and set Unicode Aliases to Yes. Joomla will now recognise non-ASCII characters in the URLs' path as long as the server itself doesn't return it URL encode. In most cases setting that option to Yes allows you to use umlauts in German or even entirely different character sets like Greek, Cyrillic, Japanese, Chinese etc. On my test setup with Apache 2.4 doing that lets me redirect URLs with German umlauts and Greek characters (these are part of the automated testing suite for Admin Tools).
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!