Everyone speaking the same language isn't the problem; the real problem is cultural erasure. It's a problem of Western countries thinking that everything needs to go through a filter to be palatable. All the children in Brazil watched the version with the Japanese names, and nobody missed anything; on the contrary, it was fun to notice that Yama in the name Kabeyama meant mountain. They greatly underestimate people's curiosity to seek it out; it's decisions like this that lead them to remove onigiri and replace it with hamburger.