service string_translation

Drupal::translation in drupal/core/lib/Drupal.php

Returns the string translation service.

install_begin_request in drupal/core/includes/install.core.inc

Begins an installation request, modifying the installation state as needed.

RegisterStringTranslatorsPass::process in drupal/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterStringTranslatorsPass.php

You can modify the container here before it is dumped to PHP code.

TestBase::prepareEnvironment in drupal/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php

Prepares the current environment for running the test.

class: Drupal\Core\StringTranslation\TranslationManager