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See here, how you can delete or control cookies:

We have two kinds of cookies on our site
One cookie remembers your choice of languages on the site. The choice can be changed at the top right of our pages. This cookie is deleted after one day.

We also use cookies from Google Analytics to analyze how the site is used. The information generated is sent to Google Analytics. See more about these cookies here: Google Analytics Cookie Usage on Websites

You can install a program to disable cookies from Google Analytics here: Google Analytics opt-out browser add-on