Fixes #12870 - Add note about fallback to en language

[sdwheeler]

PR Summary

Add note about fallback to en language

• Fixes AB#562976
• Fixes Doc about Import-LocalizedData should be updated about its language fallback behavior #12870

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

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[learn-build-service-prod]

Learn Build status updates of commit 2fed8e5:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.5/Microsoft.PowerShell.Utility/Import-LocalizedData.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Utility/Import-LocalizedData.md	✅Succeeded	View (powershell-7.6)
reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-76.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

[Copilot]

Pull request overview

Updates PowerShell documentation to reflect Import-LocalizedData’s implicit UI-culture fallback behavior (including fallback to en-US and then en) and surfaces the change in the PowerShell 7.6 “What’s New” page.

Changes:

• Add a “Notes” entry to Import-LocalizedData reference docs for PowerShell 7.5 and 7.6 describing the fallback behavior starting in 7.5.5.
• Add a “What’s New in PowerShell 7.6” bullet referencing the original engine change PR (#19896).
• Update ms.date metadata in the touched pages.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-76.md	Adds a 7.6 release note entry for the implicit localization fallback and its PR link.
reference/7.6/Microsoft.PowerShell.Utility/Import-LocalizedData.md	Documents the en-US → en fallback behavior when -UICulture isn’t specified.
reference/7.5/Microsoft.PowerShell.Utility/Import-LocalizedData.md	Same documentation update for the 7.5 reference page.

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[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit 131ac79:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.5/Microsoft.PowerShell.Utility/Import-LocalizedData.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Utility/Import-LocalizedData.md	✅Succeeded	View (powershell-7.6)
reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-76.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.