[jdk15u-dev] RFR: 8255086: Update the root locale display names

[Yuri Nesterenko]

applies totally clean. Relevant tests do pass.

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Commit messages:
 - Backport ff5f2265d20d2a462691b332eb5dfcca91a22fe4

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/17/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=17&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255086
  Stats: 234 lines in 5 files changed: 111 ins; 0 del; 123 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/17.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/17/head:pull/17

PR: https://git.openjdk.java.net/jdk15u-dev/pull/17