The Language of Character

I don't as a general rule respond to other people's comments about my books, but Fiction Desk's review of The Maze of Cadiz, and the subsequent thread of comments which I came across recently, raised some interesting questions that confront any author who writes a story with a foreign setting, where many of the conversations are actually taking place in another language that will not be understood by the majority of readers. Should you simply put everything in English - thereby making no dist...