feat: use atlas in make pull_translations (#179)

Changes
-------
 - Bump frontend-platform to bring `intl-imports.js` script
 - Move all i18n imports into `src/i18n/index.js` so `intl-imports.js` can
   override it with latest translations
 - Add `atlas` into `make pull_translations` when `OPENEDX_ATLAS_PULL`
   environment variable is set.
 - package.json and package-lock.json are copied from https://github.com/openedx/frontend-app-ora-grading/pull/176
 - updated snapshots and updated tests in sync with `frontend-platform`
 - require package-lock.json version 3: same as https://github.com/openedx/frontend-app-ora-grading/pull/176

Refs: [FC-0012 project](https://openedx.atlassian.net/l/cp/XGS0iCcQ) implementing Translation Infrastructure OEP-58.

.github/workflows/lockfileversion-check.yml

@@ -10,4 +10,4 @@ on:
 
 jobs:
   version-check:
-    uses: openedx/.github/.github/workflows/lockfileversion-check.yml@master
+    uses: openedx/.github/.github/workflows/lockfileversion-check-v3.yml@master