RFR: 8291924: jpackage: l10n for Windows context menu label [v2]

[Alex Kasko]

> This change adds `ContextMenuCommandLabel` l10n property for file association context menu label. It is a follow-up to [this PR comment](https://github.com/openjdk/jdk/pull/9224#issuecomment-1169286082).
> 
> Note, non-EN l10n values were filled using auto-translator and may need to be corrected.
> 
> To check the contents of the label, registry query is added to `PackageTest::addHelloAppFileAssociationsVerifier`.
> 
> Testing:
> 
>  - [x] ran `FileAssociationsTest` with `install` enabled

Alex Kasko has updated the pull request incrementally with one additional commit since the last revision:

  reg method access, drop l10n entries, label check enhancement

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9753/files
  - new: https://git.openjdk.org/jdk/pull/9753/files/9f762674..227ad5d4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9753&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9753&range=00-01

  Stats: 10 lines in 5 files changed: 2 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/9753.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9753/head:pull/9753

PR: https://git.openjdk.org/jdk/pull/9753