Translation update mode: Use local files only.
When checking for available translation updates, only local files will be used. Any remote translation file will be ignored. Also custom modules and themes which have set a "server pattern" to use a remote translation server will be ignored.
const LOCALE_TRANSLATION_USE_SOURCE_LOCAL = 'local';
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https://api.drupal.org/api/drupal/core!modules!locale!locale.module/constant/LOCALE_TRANSLATION_USE_SOURCE_LOCAL/8.1.x