The used language is german, not dutch ^^
However most guides/exploits and whatever threads are written in english. If they aren't, you can kindly ask someone to translate it for you. Most of the time it will take about a day or two and someone will do it for you :)
Most of the board is german-speaking though as the main community is german-speaking too. Some of the sub-boards are centered around the community so i hope you don't take it seriously that they are most likely to stay in that language.
The Hack and Exploit Boards are basically -> an english Guide followed by german comments on the guide. This might change anytime soon biased to a more broad and more international spectrum, but as i am just a user as you are... i really dunno :)