Safari displays website in wrong language after trip

TristanAx wrote:

Recently returned from a trip to Hungary. One website with an embedded Google Calendar is displaying in Magyar. Specifically, the outer frame of the calendar and the days of the week are displaying in Magyar:

https://discussions.apple.com/content/attachment/69e0d663-8729-4165-8514-637408095ddd

However, when I right-click on the calendar and open it in a new tab or window, it displays correctly:

https://discussions.apple.com/content/attachment/207a20ba-4500-488a-b1a4-786e2b1a7900

I have checked all my MacOS System Settings and have only English as my preferred language:

https://discussions.apple.com/content/attachment/a022321d-a685-4bc7-85b1-3a70ceba3ea2

I have also checked my Google language settings, which are also set to only English:

https://discussions.apple.com/content/attachment/4f7657fb-c150-465f-ab9d-175033eed443

My own Google Calendars all display correctly (in English). I tested two other browsers. The page with the embedded calendar displays correctly (in English) in both Chrome and Firefox. It is only Safari that is stuck on Magyar.

I cleared ALL the website data from Safari's Settings and quit and restarted Safari, and nothing changed.

you can choose to clear the history of significant locations or reset all location and privacy settings to their defaults

and compare your results...

no resolve—

A SafeBoot Start up your Mac in safe mode - Apple Support will sort many anomalies

Login and test. Reboot as normal and test. Caches get rebuilt automatically.