How Much Should I Try and Fit in With the Local Diet?

I don't mind babies crying on planes, although I do object to babies being on planes in the first place. When you go to a French or Italian restaurant, should you try and speak in their language? Or should you just say it in English? You want to... If you're going to whatever country, it's not just France, Spain, Italy. Even if you go to Manila, for example, you want to make sure that you know the basics. Now, this one is from Camilla. She thought she was ordering the duck in a French restaurant, but mistakenly said, conard instead of canard. Couldn't work out what everyone was looking at her so strangely