JDK-8023394: Support ECMAScript Internationalization APIs

[André Bargull]

Some comments for JDK-8023394:

Implementing ECMA-402 (ECMAScript Internationalization) will require 
updating the JDK to a more recent version of ICU4J, because certain 
features needed for ECMA-402 are not supported by the current JDK 
classes. But I don't remember anymore which exact classes and APIs are 
not supported by the JDK version, I just wanted you to give a heads up 
on this issue. Also feel free to use this implementation [1] as a 
starting point.

- André


[1] 
https://github.com/anba/es6draft/tree/master/src/main/java/com/github/anba/es6draft/runtime/objects/intl