>>398 I got your point, but I have another opinion.
One of the important purposes of using eclipse is to improve the productivity. If someone is stuck with getting used to English, and using eclipse is no longer efficient, that's absolutely nonsense.
You may say that it is worth giving a chance to improve English skill by forcing them to use English version of eclipse. However, I don't think this is always true. As you know, it can happen that we have to work with unskilled outsource partners with the contract having limited duration. In this case, what we should do is to optimize the productivity only focusing on the duration by letting them use Japanese version of eclipse.