Very unstable behavior with Japanese system locale on Windows 10

The easiest way to trigger the problem is to try installing the `language-javascript` package.

For more info, [see this and the reference chain leading from it.](https://github.com/erikd/language-javascript/issues/111)

It is surprising that no Asian users ran into this problem before. It might have been caused by me having an English install originally and then switching to a Japanese system locale. When it comes to `haskell-ide-engine`, I can confirm that the install is much more stable now, though not completely. It might be worth trying to compile the Purescript compiler from scratch to see if these issues persist.