Smoke test all locales (#20742)
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
