Not where it isn't strictly necessary and I believe it is a good thing but I've seen english being used whenever people from multiple european countries are working with each other.
It is the case in IT and definitely the case in research too. Even 27 years ago when I was an intern in France, my office was next to the office of some mathematicians, I believe one japanese, a russian and another one I don't remember and they were all speaking in english.
Not where it isn't strictly necessary and I believe it is a good thing but I've seen english being used whenever people from multiple european countries are working with each other.
It is the case in IT and definitely the case in research too. Even 27 years ago when I was an intern in France, my office was next to the office of some mathematicians, I believe one japanese, a russian and another one I don't remember and they were all speaking in english.