Why does the text in the academy change automatically?

As you've clicked on this FAQ, you're running into the fact that the text automatically changes when you're following a course. Changing text is related to Google translate. You'll find this in the top right of the browser window, see below:

If you click this icon, the following screen will appear (depending on the settings):

If it is set to Dutch, the website will automatically be translated into Dutch if English words are used. Set the website to English to prevent it from being translated automatically. Clicking on the dots reveals more settings.