RFR: 8312075: FileChooser.win32.newFolder is not updated when changing Locale

[Tejesh R]

On `NewFolderAction`, plain String is added `Action.ACTION_COMMAND_KEY`. Converting the `String `to `locale` before adding as command key fix the issue. 
I have verified the test in all other platforms and Look and Feel which has option to create New Folder, results were fine. No regressions found on CI system with the fix. Added manual test to verify the fix.

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Commit messages:
 - Whitespace removal
 - Fix + Manual Test

Changes: https://git.openjdk.org/jdk/pull/15069/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15069&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312075
  Stats: 129 lines in 3 files changed: 128 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15069.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15069/head:pull/15069

PR: https://git.openjdk.org/jdk/pull/15069