[jdk15u-dev] RFR: 8258795: Update IANA Language Subtag Registry to Version 2021-05-11

[Yuri Nesterenko]

Clean backport of "Update IANA Language Subtag Registry to Version 2021-05-11". Waiting for test finish...

-------------

Commit messages:
 - Backport a259ab4a8d163ff924ba56c5da5395cec0d8c350

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/187/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=187&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258795
  Stats: 340 lines in 2 files changed: 327 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/187.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/187/head:pull/187

PR: https://git.openjdk.java.net/jdk15u-dev/pull/187