CORE-1455: Missing translation for "Content Warning"

[jomcarvajal]

CORE-1455

[Copilot]

Pull request overview

This PR adds missing translations for "Content Warning" text across English, Spanish, and Polish locales. The changes implement internationalization support by introducing a new translation key i18n:content-warning:heading:aria-label and updating the LoginGate and ContentWarning components to use translated text instead of hardcoded English strings.

• Added translation key i18n:content-warning:heading:aria-label to all three language files (en, es, pl)
• Updated createIntl function to support optional message overrides for testing purposes
• Modified LoginGate and ContentWarning components to use the internationalization API
• Updated corresponding test files to accommodate the internationalization changes

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/app/messages/en/messages.json	Added English translation "Content Warning" for the new translation key
src/app/messages/es/messages.json	Added Spanish translation "Advertencia de contenido" for the new translation key
src/app/messages/pl/messages.json	Added Polish translation "Ostrzeżenie o treści" for the new translation key
src/app/messages/createIntl.ts	Enhanced to accept optional newMessages parameter for test message overrides
src/app/content/components/LoginGate.tsx	Replaced hardcoded "Content Warning" string with internationalized version using useIntl
src/app/content/components/ContentWarning.tsx	Replaced hardcoded "Content warning" string with internationalized version using useIntl
src/app/content/components/LoginGate.spec.tsx	Updated test to mock useIntl and added IntlProvider setup
src/app/content/components/ContentWarning.spec.tsx	Updated tests to mock useIntl and added IntlProvider setup
src/app/content/highlights/components/Highlights.spec.tsx	Updated tests to use new newMessages parameter of createIntl function

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[Dantemss]

This translation should probably be confirmed by our contact at Katalyst