Smoke test all locales

[seanbudd]

Link to issue number:

None

Summary of the issue:

2026.2rc1 would not start for Hungarian users due to bad localisations.
While we should have better validation for translation materials to prevent this, having a final safety smoke test against all locales would be useful.

Description of user facing changes:

None

Description of developer facing changes:

None

Description of development approach:

Scan source/locale and try to start NVDA with each locale. If NVDA fails to start for any locale, fail the test

Testing strategy:

• Test run with success: https://github.com/nvaccess/nvda/actions/runs/32939528905/job/98093522522?pr=20742
• Test run with failure (bad localisations): https://github.com/nvaccess/nvda/actions/runs/32942395899/job/98099228653

Known issues with pull request:

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

[Copilot]

Pull request overview

Adds a new Robot Framework smoke test suite to start NVDA once per locale found under source/locale, failing CI if any locale prevents NVDA from starting (intended as a last-line safeguard against broken localizations causing startup failures).

Changes:

• Adds a new l10n system test suite that iterates all locale codes and validates NVDA startup per locale.
• Adds a small Python helper library to discover locale codes from source/locale.
• Extends NvdaLib.start_NVDA to allow overriding NVDA’s startup language via the --lang command-line option, and wires the new suite into the CI system test matrix.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
tests/system/robot/l10nTests.robot	New Robot Framework suite that loops through locale codes and smoke-tests NVDA startup per locale.
tests/system/robot/l10nTests.py	Helper to enumerate locale codes from source/locale for the new suite.
tests/system/libraries/NvdaLib.py	Adds optional language parameter to NVDA startup to support per-locale launches.
.github/workflows/testAndPublish.yml	Adds l10n to the system test matrix so the new suite runs in CI.

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