Make Java.preferencePane easier to localize

The current process for getting new .strings or .xib files form the loc team isn't sustainable. When new strings files arrive or new languages are added I need to manually update Xcode so it can copy the new files and locales into the preference panel bundle.

Instead, we should just copy an entire folder of resources wholesale into the final product. OS X knows how to find the right resource based on the current language. Xcode doesn't need to do anything special.