[14] RFR: 8225435: Upgrade IANA Language Subtag Registry to the latest for JDK14

[naoto.sato at oracle.com]

Hi,

Please review the fix to the following issue:

https://bugs.openjdk.java.net/browse/JDK-8225435

The proposed changeset is located at:

https://cr.openjdk.java.net/~naoto/8225435/webrev.00/

The change is to upgrade the data file to the latest (dated 2019-09-16). 
A relevant test case is modified accordingly.

Naoto