If you are going to be there with a dedicated Wyrd booth (not necessarily this year, that might not be possible), my advice would be:
Get some german volunteers and let them handle anything. Give them some product freebies and they're happy. An you cater to the customers that are not that good with English.
I know, because I worked in a similar fashion for KenzerCo for 2 years back in 2001/02 or so.
I had a blast.