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My mother tongue is Spanish; from very early on I began to study English (I don't want your opinions on that! Don't hurt my feelings!), plus, living until I was 18 relatively near Brazil, Portuguese was kind of background noise that stuck to my mind and I realized that when I went holidays there in the past few years. Now I am learning Japanese, and the idea of taking my initial lessons in Esperanto more seriously is around my head (no, I am not a language freak) .
So, I have no trouble is switching languages, nowadays is second nature to me (it has to be when your own language is of little use out of your country, or your region). The amount of people that speak more than one language is relatively high around here. My wife works at an international call center in three languages, and she has to switch them on the fly.
In the dojo, I prefer to stuck to Japanese commands and voices, in spite of sounding a little snob sometimes, but I think that helps you get ready for wherever in the world you may find yourself swinging bamboo someday.