Add more localized string env vars

from https://mjtsai.com/blog/2018/03/27/nsdoublelocalizedstrings-and-friends/:

- `NSAccentuateLocalizedStrings`
- `NSSurroundLocalizedStrings`
- `NSForceRightToLeftLocalizedStrings`
- `AppleTextDirection`
- `NSForceRightToLeftWritingDirection`