Office 365 calendar html in wrong language on screen

I’m using a Office 365 calendar html link to show the calendar on my screen. The calendar is in Dutch, but shows in English. So the daynames are in English. The only way to show them in Dutch is to change the player to the Edge version.

When I show the website in Internet Explorer the language is correct in Dutch, but not in the Xibo Player. Using the newest player on version 2.3.9 of Xibo.

What can I do to fix this behaviour?

Now installed the latetest version 2 of the player, but still have te same error.

Found something:

Player V2 R202 shows the calendar good, in Dutch language like i would, after that the players shows the calendar in English. I saw on github that there is a change how the player works after version V2 R202, so that’s why I tried that version.

What is changed in the players that causes this behaviour?