RFR: 8309632: JDK 21 RDP1 L10n resource files update [v2]

[Jonathan Gibbons]

On Tue, 13 Jun 2023 18:38:28 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Left some comments on the translations mainly in Japanese. It is now very easy to look at the l10n changes in the generated HTML. One small comment to the tool is that it would be nice if the order in HTML (alphabetically sorted currently) aligns with the order in the actual resource file. It is a great improvement anyways.

1. It is not easy to recover the order in the actual resource file: the contents are read into a `Properties` object which uses a `Hashtable` to store the data. 
2. There is no guarantee that the order is the same in all the resource files, so we would have to choose one, presumably the default one, to determine the presentation order.

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PR Comment: https://git.openjdk.org/jdk/pull/14430#issuecomment-1594844435