The locale source processing needs to be in a batch operation

Problem/Motivation

The locale source processing needs to be in a batch operation because of the timing of when locales_source records are created during Drupal's installation/configuration import process.

Proposed resolution

Use batch operation to run after the main installation process completes:
* install modules (babel_install runs)
* import configurations
* finalize configuration sync
* Run batch operations, now locale strings exist!