[8u] RFR: 8255086: Update the root locale display names

[Severin Gehwolf]

Hi,

Please review this 8u backport of 8255086. The JDK 11u patch doesn't
apply cleanly after path unshuffeling due to:

- bug line differences in tests
- copyright date differences
- different context in test/java/util/Locale/LocaleTest.java
  where relevant lines are in different places

In terms of functionality, the patch should be equivalent.

Bug: https://bugs.openjdk.java.net/browse/JDK-8255086
webrev: https://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8255086/jdk8/01/webrev/

Testing: Changed regression tests and tier1

Thoughts?

Thanks,
Severin