[jdk11u-dev] RFR: 8238203: Return value of GetUserDefaultUILanguage() should be handled as LANGID

[Stephanie Crater]

Backport of JDK-8238203
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### Progress
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- [x] Change must not contain extraneous whitespace
- [x] Commit message must refer to an issue

### Error
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Commit messages:
 - Merge branch 'openjdk:master' into jdk-8238203
 - Backport 1cd5eac5c36b32ca35a23668c3124f23787d91d0

Changes: https://git.openjdk.org/jdk11u-dev/pull/1224/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1224&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8238203
  Stats: 6 lines in 1 file changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1224.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1224/head:pull/1224

PR: https://git.openjdk.org/jdk11u-dev/pull/1224