MS Edge kiosk mode offer to translate webpage

I have created a Microsoft Edge Kiosk mode based on the manual at: Configure Microsoft Edge kiosk mode | Microsoft Docs, using Windows Settings

I have previously used kiosk mode, both "Digital/Interactive Signage" and "Public-Browsing" with the old Edge, without problems.

Then I created a new Kiosk machine, based on Edge Chromium, an "Digital/Interactive Signage". It works well, except for it will always ask to set over the page from Norwegian to English! The page is a room plan for the building, updated regularly  at: TP: Timeplan (uio.no)

It's impossible to get rid of this message, it's popping up all the time.

Normally there is an option "Do not offer translation from Norwegian to English", but it's not there. If I translate from Norwegian to English, it has forgotten that choice next time the page is reloaded. 

If I choose "Not now", it's forgotten next time the page is reloaded.

If I accept Edge to set over from Norwegian to English, it does so, but the choice is forgotten next time the webpage is reloaded.

I also tried to set over from Norwegian to Norwegian, but at next refresh the choice was forgotten.

I have set up two computers with this kiosk configuration, one in Active Directory, one stand-alone, same result

The computer is Win10, Edge 97.0.1072.25