Attached is a screenshot of the module I am seeing when I visit your page. It looks to be correct in German to me. Am I incorrect in that there's something not translated, or is it showing up differently for you?
Could you try making the following code change? In /modules/mod_scsocialstream/mod_scsocialstream.php at line 25 (after the if block to check for JFBCFactory), can you add: