To make this site work properly, we sometimes place small data files called cookies on your device

What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don't have to keep re-entering them whenever you come back to the site or browse from one page to another.

Other cookies, from third parties, could also be used to track you when you navigate to other sites that also use services from these third parties.

How to control cookies

You can control and/or delete cookies as you wish - for details, see You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.

How do we use cookies?

Necessary cookies

Name Provider Purpose Expiry
PHPSESSID Stores user preferences across pages Session
csrf_https-contao_csrf_token Prohibits the use of fake requests in your name Session
cookie_optout Stores whether a user has seen and accepted the use of cookies by this site 52 weeks


Our website uses Matomo (formerly Piwik) open source software for statistical analysis of visitor access. Matomo uses cookies, which are stored on your computer and which enable your use of the website to be analyzed anonymously. It is not possible to identify a specific person, because your IP address is anonymized immediately after processing and prior to being stored.

Matomo is used for the purpose of improving the quality of our website and its content. It enables us to find out how the website is used and to continually optimize our services.

The cookies used by Matomo are stored on the user's computer and sent to our site by that computer. Consequently, you as a user have full control over the use of cookies. Cookies that have already been stored can be deleted at any time. This process can also be automated. You can object at any time to Matomo storing and analyzing this data []. In this case, an opt-out cookie is stored permanently in your browser, with the result that Matomo will not collect any data for storage and analysis. Please note that if you intentionally or unintentionally delete this cookie, the objection to data storage and analysis will also be canceled; it can be re-activated using the above link. Alternatively, most modern browsers have a "Do not track" option that tells websites not to track your user activity. Matomo respects this option.

Name Provider Purpose Expiry
_pk_id Used to check whether a user has already visited the site before. 56 weeks
_pk_ses User’s Session ID Session