Ehi man, welcome! We already have amazing German/Zentyal people here, I think that @gerald_FS is your man in this case. You might start to help him with german translations, would you like to lend a hand:
It’s fair and you’re right, changing his own platform isn’t easy at all. Would you like to help us to write down a simple getting started howto to drive Zentyal refugees into such journey? You might gather which challenges, issues, differences you will face. What do you think? Le’ts open a new topic about it now!