Hi Mattias,
I created a page with this name on demo.mojoportal.com and it works correctly if you click the link in the menu.
What I find is if you paste the url into the browser url input it does escape the characters and this does not work, but clicking the link in the menu does work. There is nothing I can do about this feature of web browsers but typically visitors are going to click the links not paste the url so it should generally work fine.
Hope it helps,
Joe