Changing language in the staff client results in a redirection error that firefox relates to blocked cookies (which is not the case). This has been a problem before, but I could not find the bug.
The description is somewhat inaccurate as the language does get changed, but you have to hit the back button from the error page or reload.
Hi Mirko, are you still seeing this problem?
I don't think it still an issue. Feel free to reopen if you still encounter this problem.