migrate: flask_babelex replaced by invenio_i18n

invenio_previewer/__init__.py

@@ -74,7 +74,7 @@ Extensions
 Now that we have configured the Flask application, let's initialize all
 dependent Invenio extensions:
 
->>> from flask_babelex import Babel
+>>> from invenio_i18n import Babel
 >>> from invenio_assets import InvenioAssets
 >>> from invenio_db import InvenioDB, db
 >>> from invenio_records import InvenioRecords

tests/conftest.py

@@ -19,7 +19,6 @@ from zipfile import ZipFile
 
 import pytest
 from flask import Flask
-from flask_babelex import Babel
 from flask_webpackext import current_webpack
 from invenio_assets import InvenioAssets
 from invenio_config import InvenioConfigDefault
@@ -28,6 +27,7 @@ from invenio_db import db as db_
 from invenio_files_rest import InvenioFilesREST
 from invenio_files_rest.models import Location, ObjectVersion
 from invenio_formatter import InvenioFormatter
+from invenio_i18n import Babel
 from invenio_pidstore.providers.recordid import RecordIdProvider
 from invenio_records import InvenioRecords
 from invenio_records_files.api import Record