Not to travel to far down this rabbit trail, but one of the reasons there are non-english speaking techs is because large portions of America are non-english speaking <cough> Mexicans <cough> ...
I do my best to refuse to communicate in any language other than English. Because darnit, if you are going to LIVE here, you had better learn THIS language. If I moved to the Philippines, I'd darn well better speak at least Visyan and Tagalog (depending on the local) or if I moved the Mexico I'd speak Spanish.