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diff --git a/web/core/modules/config_translation/src/ConfigFieldMapper.php b/web/core/modules/config_translation/src/ConfigFieldMapper.php
new file mode 100644
index 000000000..c0e085f11
--- /dev/null
+++ b/web/core/modules/config_translation/src/ConfigFieldMapper.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace Drupal\config_translation;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Configuration mapper for fields.
+ *
+ * On top of plugin definition values on ConfigEntityMapper, the plugin
+ * definition for field mappers are required to contain the following
+ * additional keys:
+ * - base_entity_type: The name of the entity type the fields are attached to.
+ */
+class ConfigFieldMapper extends ConfigEntityMapper {
+
+  /**
+   * Loaded entity instance to help produce the translation interface.
+   *
+   * @var \Drupal\field\FieldConfigInterface
+   */
+  protected $entity;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getBaseRouteParameters() {
+    $parameters = parent::getBaseRouteParameters();
+    $base_entity_info = $this->entityManager->getDefinition($this->pluginDefinition['base_entity_type']);
+    $bundle_parameter_key = $base_entity_info->getBundleEntityType() ?: 'bundle';
+    $parameters[$bundle_parameter_key] = $this->entity->getTargetBundle();
+    return $parameters;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOverviewRouteName() {
+    return 'entity.field_config.config_translation_overview.' . $this->pluginDefinition['base_entity_type'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTypeLabel() {
+    $base_entity_info = $this->entityManager->getDefinition($this->pluginDefinition['base_entity_type']);
+    return $this->t('@label fields', ['@label' => $base_entity_info->getLabel()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setEntity(ConfigEntityInterface $entity) {
+    if (parent::setEntity($entity)) {
+
+      // Field storage config can also contain translatable values. Add the name
+      // of the config as well to the list of configs for this entity.
+      /** @var \Drupal\field\FieldStorageConfigInterface $field_storage */
+      $field_storage = $this->entity->getFieldStorageDefinition();
+      /** @var \Drupal\Core\Config\Entity\ConfigEntityTypeInterface $entity_type_info */
+      $entity_type_info = $this->entityManager->getDefinition($field_storage->getEntityTypeId());
+      $this->addConfigName($entity_type_info->getConfigPrefix() . '.' . $field_storage->id());
+      return TRUE;
+    }
+    return FALSE;
+  }
+
+}