RFR: 8264425: Update building.md on non-English locales on Windows [v2]

[Magnus Ihse Bursie]

> Update the build documentation to reflect the fact that non-English locales are only supported on a "best effort" principle, and add instructions how to install the necessary language pack to Visual Studio.

Magnus Ihse Bursie has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into readme-locale
 - Update wording according to review suggestion
 - 8264425: Update building.md on non-English locales on Windows

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16694/files
  - new: https://git.openjdk.org/jdk/pull/16694/files/fec451ca..038407b3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16694&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16694&range=00-01

  Stats: 664443 lines in 2518 files changed: 105906 ins; 485645 del; 72892 mod
  Patch: https://git.openjdk.org/jdk/pull/16694.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16694/head:pull/16694

PR: https://git.openjdk.org/jdk/pull/16694