The shortage of skilled workers means that your team is becoming increasingly international.  Not only are language skills important, but also a good understanding of German work culture. It is equally important for your German employees to understand their international colleagues well, as this can increase productivity and ensure a cooperative work environment. 

Additionally, your colleagues may feel insecure in this new work environment and require support. Cultural differences in leadership styles, attitude to feedback, or even gift-giving can cause frustration and lead to misunderstandings. Help your staff cope better with change, embrace differences and improve their overall cultural nous.