Translation update mode: Use both remote and local files.
When checking for available translation updates, both local and remote files will be checked.
const LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL = 'remote_and_local';
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https://api.drupal.org/api/drupal/core!modules!locale!locale.module/constant/LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL/8.1.x