We are an international forum. Everyone can write in the language he/she want. What should we do in your opinion? Force everyone to speak english? This is impossible. There are so many german speaker because this site is originally from germany.
So if you don't understand something, ask other user to translate it for you or use an english translater. Imagine everyone is now speaking in english, and there are many people who can't understand it. Now they are complain about the english only. I think you can understand what I'm talking about.
P.S.: We are still working on the translation for the sections.