<i18n dev> RFR: 8247432: Update IANA Language Subtag Registry to Version 2020-09-29

[Naoto Sato]

Hi,

Please review the changes to the subject issue. This is to incorporate the latest language subtag registry definition into the JDK.

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Commit messages:
 - LSR 2020-09-29
 - LSR 2020-07-17

Changes: https://git.openjdk.java.net/jdk/pull/1357/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1357&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247432
  Stats: 52 lines in 2 files changed: 44 ins; 5 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1357.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1357/head:pull/1357

PR: https://git.openjdk.java.net/jdk/pull/1357