<i18n dev> RFR: 8290300: Use standard String-joining tools where applicable [v2]

[Naoto Sato]

On Fri, 15 Jul 2022 12:40:50 GMT, Сергей Цыпанов <duke at openjdk.org> wrote:

>> Simplify code with `String.join()`
>
> Сергей Цыпанов has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - 8290300: Revert jops
>  - 8290300: Revert jops

Changes to `Locale` look good to me.

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Marked as reviewed by naoto (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9513