EasySocial and german language problem

hi StackIdeas,

I have problem when switching language to German. When switching Joomla (Frontend & Backend) language to German I see that EasySocial switches back to English instead of German. When I switch Joomla to other language like Polish - it is ok - both Joomla and EasySocial are in polish. So the problem appears only for German in EasySocial.

I have checked all languages are correctly installed - both in Joomla and EasySocial I see German and Polish installed correctly.

What could be the reason of missing German in EasySocial?

thanks in advance
Martin