RFR: 8252: JMC localization does not work as expected for Chinese locale

[Virag Purnam]

JMC localization was not working fine for Chinese locale.
**Issue:**
<img width="960" alt="Issue" src="https://github.com/user-attachments/assets/efdaaae6-11c8-4ab8-aed6-e6b055051e86">

**Fix:**
We need to change the name of all properties file from ***_zh_CN.properties** to ***_zh.properties**. WIth this change JMC takes works for Chinese locale.

<img width="956" alt="IssueResolved" src="https://github.com/user-attachments/assets/b92e6587-ef39-4e3a-876a-49d4f61f1dd6">

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Commit messages:
 - 8252: JMC localization does not work as expected for Chinese locale
 - 8252: JMC localization does not work as expected for Chinese locale

Changes: https://git.openjdk.org/jmc/pull/587/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=587&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8252
  Stats: 148 lines in 125 files changed: 0 ins; 0 del; 148 mod
  Patch: https://git.openjdk.org/jmc/pull/587.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/587/head:pull/587

PR: https://git.openjdk.org/jmc/pull/587