RFR: JDK-8294994: Update Jarsigner and Keytool i18n tests to validate i18n compliance [v4]

[Naoto Sato]

On Wed, 12 Oct 2022 18:31:16 GMT, Bill Huang <bhuang at openjdk.org> wrote:

>> The jarsigner and keytool are localized into English, German, Japanese and Simplified Chinese. This task is to modify the existing i18n tests to validate i18n compliance in these tools. 
>> 
>> In addition, this task also contains changes for manual test enhancement and simplification which originated from [JDK-8292663](https://bugs.openjdk.org/browse/JDK-8292663).
>
> Bill Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixed typo.

Marked as reviewed by naoto (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10635