locale_translation_batch_fetch_build($projects = array(), $langcodes = array(), $options = array()) Builds
locale_translation_batch_update_build($projects = array(), $langcodes = array(), $options = array()) Builds
The API for download and import of translations from remote and local sources. File core/modules/locale/locale
_locale_translation_fetch_operations($projects, $langcodes, $options) Helper function to construct the batch