Yes, the software is available in many languages (Polish included), but there is some unknown information about it. For example, to obtain the price for the software, you will have to contact the developers using Request quote. The Request quote option will provide licence information, price, application's info, buying options, payment methods and compatibility. The only thing listed on their website is the available of Free Updates, after the product has been purchased. Additionally, contact a local representative. Access the countries page and click on your country to find the man who handles the information for SAS Enterprise Guide. In Poland you can email and call using these details:
e-mail: support@spl.sas.com
Tel: +48 22 560 46 66