RFR: 8348328: Update IANA Language Subtag Registry to Version 2025-05-15

[Justin Lu]

On Wed, 28 May 2025 17:00:22 GMT, Justin Lu <jlu at openjdk.org> wrote:

> Please review this PR which updates the language subtag registry to Version 2025-05-15.
> 
> LanguageSubtagRegistryTest.java was updated with the preferred-values: `hnm`, `eko`, `luh`,`sjc`, `sqm`. A small change was also made to the test to improve the output as well.

Thanks for the reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/25503#issuecomment-2920015564