This question already has an answer here:
As one of the employees tasked with monitoring the meta sites across the network, I have a small request. While I consider myself an articulate, intelligent human being, I don't speak or understand German. Of the SE team, only one of us is fluent in German insofar as I recall.
As such, I have a humble request: on the meta site, please use English! It is really difficult for me to address issues or follow a conversation that I don't understand, and I am loathe to paste text into a translation engine. It also isn't fair for me to shuffle all the monitor duties for this site onto our sole German-speaking developer employee.
As such, for the meta site alone please default to English for discussion. That way, if/when issues come up that we need to attend to, we (that is, the Community Managers, developers, et al) can assess and respond to the situation in an expeditious manner. :D