Nav Menu: Localize "No Parent" and menu item labels in nav menu options

[yogeshbhutkar]

Description

Updated raw strings to use i18n functions.

Trac ticket: https://core.trac.wordpress.org/ticket/62402

Screenshot of the fix:

---

This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core Committers: Use this line as a base for the props when committing in SVN:

Props yogeshbhutkar, joedolson, desrosj.

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[github-actions]

Test using WordPress Playground

The changes in this pull request can previewed and tested using a WordPress Playground instance.

WordPress Playground is an experimental project that creates a full WordPress instance entirely within the browser.

Some things to be aware of

• The Plugin and Theme Directories cannot be accessed within Playground.
• All changes will be lost when closing a tab with a Playground instance.
• All changes will be lost when refreshing the page.
• A fresh instance is created each time the link below is clicked.
• Every time this pull request is updated, a new ZIP file containing all changes is created. If changes are not reflected in the Playground instance,
  it's possible that the most recent build failed, or has not completed. Check the list of workflow runs to be sure.

For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

Test this pull request with WordPress Playground.

[desrosj]

Should the two of strings use wp.i18n._x instead of wp.i18n.__ to provide additional context to translators? It may not be clear what is being translated.

[yogeshbhutkar]

Thanks, @desrosj for suggesting an improvement here.

Sure, it would be better to provide context to the translator. I've added a patch for the same. Thanks.

[desrosj]

@yogeshbhutkar one more change! @SergeyBiryukov confirmed in track that wp.i18n.sprintf() is actually the correct function.

[yogeshbhutkar]

Thanks, @desrosj.

The changes are appended to the PR.

[joedolson]

I made a change purely for readability, but otherwise this is good to go.

[desrosj]

Merged in https://core.trac.wordpress.org/changeset/59426 & https://core.trac.wordpress.org/changeset/59431.