You actually might have two different problems. One is language - do choose English as the lingua franca, and make sure the people you hire speak it well enou

You actually might have two different problems. One is language - do choose English as the lingua franca, and make sure the people you hire speak it well enough. To some extent, you need to hire people you can work with, and it starts with language. If you choose the local language, you just won't be able to hire. The other one is much harder, and is culture. Basically, what might seem perfectly fine to a Dutch or a French, will sound exceedingly brutal or arrogant to a Brit, and this will lead to a neverending stream of misunderstandings, unless everyone's aware of it.