While the Google engineers work their magic, you can use this nice link here to get to Google Classroom in English:
Here are two more:
If you want to do it by hand:
- Open Google Classroom in your favourite way.
- Click on the web browser's URL bar.
- Go all the way to the end, and add (without the quotes) "?hl=en"
- Press Enter
PS: Maybe this was this year's only and lonely blog post. Who knows? :)