RFR: 8262945: [macos] Regression Manual Test for Key Events Fails

[Alisen Chung]

Added a check for active keyboard language and added support for Russian NSEvent keyCodes to JavaVirtualKeyCode translation. Originally, only English characters were checked for even if other languages were in native letterCharacterSet. Can be easily expanded to include other languages as well.

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Commit messages:
 - 8262945: [macos] Regression Manual Test for Key Events Fails

Changes: https://git.openjdk.java.net/jdk/pull/5617/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5617&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262945
  Stats: 20 lines in 1 file changed: 17 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5617.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5617/head:pull/5617

PR: https://git.openjdk.java.net/jdk/pull/5617