chore: remove intl-imports, transifex-utils, and dead i18n placeholders

- Remove `intl-imports` and `transifex-utils` CLI scripts and their test
  fixtures — both are superseded by `translations:pull`/`translations:prepare`
  and the updated extraction pipeline in alpha.16+
- Remove dead per-app i18n placeholder directories (`shell/dev/devHome/i18n/`,
  `test-site/src/authenticated-page/i18n/`) now that `App.messages` is gone
- Update `tools/cli/README.md` and `docs/how_tos/migrate-frontend-app.md`
  to reflect the new translation workflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: brian-smith-tcril

docs/how_tos/migrate-frontend-app.md

@@ -523,53 +523,32 @@ i18n
 
 Description fields are now required on all i18n messages in the repository.  This is because of a change to the ESLint config.
 
-Also, replace the contents of `src/i18n/index.js` with:
-
-```
-// Placeholder be overridden by `make pull_translations`
-export default {
-  ar: {},
-  'zh-hk': {},
-  'zh-cn': {},
-  uk: {},
-  'tr-tr': {},
-  th: {},
-  te: {},
-  ru: {},
-  'pt-pt': {},
-  'pt-br': {},
-  'it-it': {},
-  id: {},
-  hi: {},
-  he: {},
-  'fr-ca': {},
-  fa: {},
-  'es-es': {},
-  'es-419': {},
-  el: {},
-  'de-de': {},
-  da: {},
-  bo: {},
-};
-```
+Translations are now pulled and prepared using the `openedx translations:pull` CLI command. Add an `atlasTranslations` field to your `package.json` so the command knows where to find your app's translations and which dependencies to resolve transitively:
 
-Finally, edit the `Makefile` so that no strings are being pulled from `frontend-component-(header|footer)`, and rename `frontend-platform` to `frontend-base`.  Such as:
+```json
+"atlasTranslations": {
+  "path": "translations/frontend-app-[YOUR_APP]/src/i18n/messages",
+  "dependencies": ["@openedx/frontend-base"]
+}
+```
 
-```Makefile
-# Pulls translations using atlas.
-pull_translations:
-	mkdir src/i18n/messages
-	cd src/i18n/messages \
-	   && atlas pull $(ATLAS_OPTIONS) \
-	            translations/frontend-base/src/i18n/messages:frontend-base \
-	            translations/paragon/src/i18n/messages:paragon \
-	            translations/frontend-app-[YOUR_APP]/src/i18n/messages:frontend-app-[YOUR_APP]
+Also add a `translations:pull` script to your `package.json`:
 
-	$(intl_imports) frontend-base paragon frontend-app-[YOUR_APP]
-```
+```json
+"scripts": {
+  "translations:pull": "openedx translations:pull"
+}
 ```
+
+And update your `pull_translations` Makefile target to use it:
+
+```Makefile
+pull_translations: | requirements
+	npm run translations:pull
 ```
 
+Running `npm run translations:pull` will pull translations from `openedx-translations` and generate `src/i18n/messages.ts`.
+
 SVGR "ReactComponent" imports have been removed
 ===============================================
 

package.json

@@ -16,9 +16,7 @@
     "/dist"
   ],
   "bin": {
-    "intl-imports.js": "./dist/tools/cli/intl-imports.js",
-    "openedx": "./dist/tools/cli/openedx.js",
-    "transifex-utils.js": "./dist/tools/cli/transifex-utils.js"
+    "openedx": "./dist/tools/cli/openedx.js"
   },
   "atlasTranslations": {
     "path": "translations/frontend-base/src/i18n/messages",