feat: add translations:pull support

[arbrandes]

Description

Adds the translations:pull npm script and corresponding Makefile target (pull_translations) so that translated message files can be fetched via openedx translations:pull. Configures atlasTranslations in package.json with the authn and learner-dashboard dependencies.

Also adds the src/i18n/index.js re-export module and a placeholder src/i18n/messages.ts (force-added despite being gitignored) so the build doesn't break before translations are pulled. Updates .gitignore with the standard i18n generated file patterns.

LLM usage notice

Built with assistance from Claude.

[brian-smith-tcril]

I'm working on the authn and learner-dashboard PRs right now. Those will need to land first so we have versions of authn and learner-dashboard that include atlasTranslations in their package.jsons.

[brian-smith-tcril]

Suggested change

	npm run translations:pull
	npm run translations:pull -- --atlas-options="$(ATLAS_OPTIONS)"

Noticed this was missing from the migration guide when I was updating the authn and learner-dashboard PRs. Make a PR to update the guide openedx/frontend-base#217.

[brian-smith-tcril]

This shouldn't be checked in, we should instead have the messages.d.ts from the migration guide

import type { SiteMessages } from '@openedx/frontend-base';

declare const messages: SiteMessages;
export default messages;

[brian-smith-tcril]

With the fallback plugin "placeholder" isn't fully correct here.

[brian-smith-tcril]

We probably want to regenerate the lockfile to ensure npm ci pulls in versions of authn and learner-dashboard that include atlasTranaslations blocks in their package.jsons.

[brian-smith-tcril]

Thanks for doing this one and finding the issues that led to

• openedx/frontend-app-authn#1662 and
• openedx/frontend-app-learner-dashboard#826

LGTM!