Concrete5 8.1.0 - Automatic forwarding to the correct language does not work

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Dear Community,

I have found the following problem or phenomenon in C5 8.1.0. If I change the language, for example in English then the page is displayed in English. Everything ok so far. I then go to the bottom / account/edit_profile is also translated correctly. If I go also /account/welcome then it jumps back into the standard language (German). I have tried many settings. Unfortunately it does not work. Likewise, automatic forwarding does not work to the right language. The default language is always loaded. In version 5.7 this worked without problems. Do you have ideas or is it with you so? I am looking forward to your feedback. Best regards Frank