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diff --git a/web/core/modules/comment/src/Plugin/migrate/source/d7/CommentEntityTranslation.php b/web/core/modules/comment/src/Plugin/migrate/source/d7/CommentEntityTranslation.php
new file mode 100644
index 000000000..a749f7107
--- /dev/null
+++ b/web/core/modules/comment/src/Plugin/migrate/source/d7/CommentEntityTranslation.php
@@ -0,0 +1,103 @@
+<?php
+
+namespace Drupal\comment\Plugin\migrate\source\d7;
+
+use Drupal\migrate\Row;
+use Drupal\migrate_drupal\Plugin\migrate\source\d7\FieldableEntity;
+
+/**
+ * Provides Drupal 7 comment entity translation source plugin.
+ *
+ * @MigrateSource(
+ *   id = "d7_comment_entity_translation",
+ *   source_module = "entity_translation"
+ * )
+ */
+class CommentEntityTranslation extends FieldableEntity {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+    $query = $this->select('entity_translation', 'et')
+      ->fields('et')
+      ->fields('c', [
+        'subject',
+      ])
+      ->condition('et.entity_type', 'comment')
+      ->condition('et.source', '', '<>');
+
+    $query->innerJoin('comment', 'c', 'c.cid = et.entity_id');
+    $query->innerJoin('node', 'n', 'n.nid = c.nid');
+
+    $query->addField('n', 'type', 'node_type');
+
+    $query->orderBy('et.created');
+
+    return $query;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function prepareRow(Row $row) {
+    $cid = $row->getSourceProperty('entity_id');
+    $language = $row->getSourceProperty('language');
+    $node_type = $row->getSourceProperty('node_type');
+    $comment_type = 'comment_node_' . $node_type;
+
+    // Get Field API field values.
+    foreach ($this->getFields('comment', $comment_type) as $field_name => $field) {
+      // Ensure we're using the right language if the entity is translatable.
+      $field_language = $field['translatable'] ? $language : NULL;
+      $row->setSourceProperty($field_name, $this->getFieldValues('comment', $field_name, $cid, NULL, $field_language));
+    }
+
+    // If the comment subject was replaced by a real field using the Drupal 7
+    // Title module, use the field value instead of the comment subject.
+    if ($this->moduleExists('title')) {
+      $subject_field = $row->getSourceProperty('subject_field');
+      if (isset($subject_field[0]['value'])) {
+        $row->setSourceProperty('subject', $subject_field[0]['value']);
+      }
+    }
+
+    return parent::prepareRow($row);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    return [
+      'entity_type' => $this->t('The entity type this translation relates to'),
+      'entity_id' => $this->t('The entity ID this translation relates to'),
+      'revision_id' => $this->t('The entity revision ID this translation relates to'),
+      'language' => $this->t('The target language for this translation.'),
+      'source' => $this->t('The source language from which this translation was created.'),
+      'uid' => $this->t('The author of this translation.'),
+      'status' => $this->t('Boolean indicating whether the translation is published (visible to non-administrators).'),
+      'translate' => $this->t('A boolean indicating whether this translation needs to be updated.'),
+      'created' => $this->t('The Unix timestamp when the translation was created.'),
+      'changed' => $this->t('The Unix timestamp when the translation was most recently saved.'),
+      'subject' => $this->t('The comment title.'),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    return [
+      'entity_id' => [
+        'type' => 'integer',
+        'alias' => 'et',
+      ],
+      'language' => [
+        'type' => 'string',
+        'alias' => 'et',
+      ],
+    ];
+  }
+
+}