Save off the html file locally, most likely it uses a css file for the layout and other customization of the appearance.
So navigate to your page and then go to the File menu, usually there’s a save option there. In that same menu there should be an “Open File” option (or something similar) that you can open the file you just saved with.
Once it’s separated from the CSS file it should render in a very basic manner which might be more readable after translation. If you keep it as an html file you can still open it in your browser and use the tools there.
As an alternative, you can view the source of the file (different ways to do this dependent on the browser you’re using, usually you can right click in a blank area of the screen and an option will be available or navigate through the menus) and then remove the html markup to leave you with just the text. A tool like this will make it easier.