Most of the authors here are German, that's the reason you find so many German patterns.
But this website is growing and so the number of English patterns also grows. Many of the German authors translate their patterns into English and we even have some international authors who only sell in English.
If you only want to see the English patterns, you can click the small globe and (only) select the English flag.
Attention: some patterns are in both languages, so maybe a pattern has a German title, but you also get the English version. You should find this information in the product description.
If you're not sure, just ask the author! :)