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diff --git a/web/core/modules/config_translation/src/ConfigMapperManager.php b/web/core/modules/config_translation/src/ConfigMapperManager.php
new file mode 100644
index 000000000..a43f08083
--- /dev/null
+++ b/web/core/modules/config_translation/src/ConfigMapperManager.php
@@ -0,0 +1,199 @@
+<?php
+
+namespace Drupal\config_translation;
+
+use Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Config\TypedConfigManagerInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Extension\ThemeHandlerInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+use Drupal\Core\Plugin\Discovery\InfoHookDecorator;
+use Drupal\Core\Plugin\Discovery\YamlDiscovery;
+use Drupal\Core\Plugin\Discovery\ContainerDerivativeDiscoveryDecorator;
+use Drupal\Core\Plugin\Factory\ContainerFactory;
+use Drupal\Core\TypedData\TraversableTypedDataInterface;
+use Drupal\Core\TypedData\TypedDataInterface;
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * Manages plugins for configuration translation mappers.
+ */
+class ConfigMapperManager extends DefaultPluginManager implements ConfigMapperManagerInterface {
+
+  /**
+   * The typed config manager.
+   *
+   * @var \Drupal\Core\Config\TypedConfigManagerInterface
+   */
+  protected $typedConfigManager;
+
+  /**
+   * The theme handler.
+   *
+   * @var \Drupal\Core\Extension\ThemeHandlerInterface
+   */
+  protected $themeHandler;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaults = [
+    'title' => '',
+    'names' => [],
+    'weight' => 20,
+    'class' => '\Drupal\config_translation\ConfigNamesMapper',
+  ];
+
+  /**
+   * Constructs a ConfigMapperManager.
+   *
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   The cache backend.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   * @param \Drupal\Core\Config\TypedConfigManagerInterface $typed_config_manager
+   *   The typed config manager.
+   * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
+   *   The theme handler.
+   */
+  public function __construct(CacheBackendInterface $cache_backend, LanguageManagerInterface $language_manager, ModuleHandlerInterface $module_handler, TypedConfigManagerInterface $typed_config_manager, ThemeHandlerInterface $theme_handler) {
+    $this->typedConfigManager = $typed_config_manager;
+
+    $this->factory = new ContainerFactory($this, '\Drupal\config_translation\ConfigMapperInterface');
+
+    // Let others alter definitions with hook_config_translation_info_alter().
+    $this->moduleHandler = $module_handler;
+    $this->themeHandler = $theme_handler;
+
+    $this->alterInfo('config_translation_info');
+    // Config translation only uses an info hook discovery, cache by language.
+    $cache_key = 'config_translation_info_plugins' . ':' . $language_manager->getCurrentLanguage()->getId();
+    $this->setCacheBackend($cache_backend, $cache_key, ['config_translation_info_plugins']);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getDiscovery() {
+    if (!isset($this->discovery)) {
+      // Look at all themes and modules.
+      // @todo If the list of installed modules and themes is changed, new
+      //   definitions are not picked up immediately and obsolete definitions
+      //   are not removed, because the list of search directories is only
+      //   compiled once in this constructor. The current code only works due to
+      //   coincidence: The request that installs (for instance, a new theme)
+      //   does not instantiate this plugin manager at the beginning of the
+      //   request; when routes are being rebuilt at the end of the request,
+      //   this service only happens to get instantiated with the updated list
+      //   of installed themes.
+      $directories = [];
+      foreach ($this->moduleHandler->getModuleList() as $name => $module) {
+        $directories[$name] = $module->getPath();
+      }
+      foreach ($this->themeHandler->listInfo() as $theme) {
+        $directories[$theme->getName()] = $theme->getPath();
+      }
+
+      // Check for files named MODULE.config_translation.yml and
+      // THEME.config_translation.yml in module/theme roots.
+      $this->discovery = new YamlDiscovery('config_translation', $directories);
+      $this->discovery = new InfoHookDecorator($this->discovery, 'config_translation_info');
+      $this->discovery = new ContainerDerivativeDiscoveryDecorator($this->discovery);
+    }
+    return $this->discovery;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMappers(RouteCollection $collection = NULL) {
+    $mappers = [];
+    foreach ($this->getDefinitions() as $id => $definition) {
+      $mappers[$id] = $this->createInstance($id);
+      if ($collection) {
+        $mappers[$id]->setRouteCollection($collection);
+      }
+    }
+
+    return $mappers;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function processDefinition(&$definition, $plugin_id) {
+    parent::processDefinition($definition, $plugin_id);
+
+    if (!isset($definition['base_route_name'])) {
+      throw new InvalidPluginDefinitionException($plugin_id, "The plugin definition of the mapper '$plugin_id' does not contain a base_route_name.");
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildDataDefinition(array $definition, $value = NULL, $name = NULL, $parent = NULL) {
+    return $this->typedConfigManager->buildDataDefinition($definition, $value, $name, $parent);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function findDefinitions() {
+    $definitions = $this->getDiscovery()->getDefinitions();
+    foreach ($definitions as $plugin_id => &$definition) {
+      $this->processDefinition($definition, $plugin_id);
+    }
+    if ($this->alterHook) {
+      $this->moduleHandler->alter($this->alterHook, $definitions);
+    }
+
+    // If this plugin was provided by a module that does not exist, remove the
+    // plugin definition.
+    foreach ($definitions as $plugin_id => $plugin_definition) {
+      if (isset($plugin_definition['provider']) && !in_array($plugin_definition['provider'], ['core', 'component']) && (!$this->moduleHandler->moduleExists($plugin_definition['provider']) && !in_array($plugin_definition['provider'], array_keys($this->themeHandler->listInfo())))) {
+        unset($definitions[$plugin_id]);
+      }
+    }
+    return $definitions;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function hasTranslatable($name) {
+    return $this->findTranslatable($this->typedConfigManager->get($name));
+  }
+
+  /**
+   * Returns TRUE if at least one translatable element is found.
+   *
+   * @param \Drupal\Core\TypedData\TypedDataInterface $element
+   *   Configuration schema element.
+   *
+   * @return bool
+   *   A boolean indicating if there is at least one translatable element.
+   */
+  protected function findTranslatable(TypedDataInterface $element) {
+    // In case this is a sequence or a mapping check whether any child element
+    // is translatable.
+    if ($element instanceof TraversableTypedDataInterface) {
+      foreach ($element as $child_element) {
+        if ($this->findTranslatable($child_element)) {
+          return TRUE;
+        }
+      }
+      // If none of the child elements are translatable, return FALSE.
+      return FALSE;
+    }
+    else {
+      $definition = $element->getDataDefinition();
+      return isset($definition['translatable']) && $definition['translatable'];
+    }
+  }
+
+}