RFR: JDK-8207243: Fix translation filtering to also support zh_HK and zh_TW

[Tim Bell]

Erik:

> The zh_HK translation is mostly generated by copying the zh_TW
> translation. Because of this, there are different types of rules defined
> for generating those and the recently added filtering mechanism won't
> work for it. This patch fixes that as well as adds those translations to
> the Oracle filter list. It also further modifies the
> logging/LocalizedLevelName test to only use translations provided by
> Oracle.
>
> Webrev: http://cr.openjdk.java.net/~erikj/8207243/webrev.01/index.html
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8207243

Looks good.

/Tim