<i18n dev> RFR: 8303917: Update ISO 639 language codes table [v2]

[Justin Lu]

> This PR modifies `java.util.LocaleISOData.isoLanguageTable` to include (name only) changes from up-to-date [ISO 639 data](http://www.loc.gov/standards/iso639-2/php/code_list.php.).
> 
> In addition, this PR updates the ISO 639 data (generated in 1999) in `Bug4175998Test.java`. This includes modifying the `generate_Tables() `function, since the source data is now stored in a different format. The outdated raw data stored in the bottom of the file was removed.

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  Simplfy print statements

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12980/files
  - new: https://git.openjdk.org/jdk/pull/12980/files/5000c261..a43f9f4e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12980&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12980&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/12980.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12980/head:pull/12980

PR: https://git.openjdk.org/jdk/pull/12980