.../modules/media/src/Plugin/Filter/MediaEmbed.php |  1 +
 .../src/Kernel/MediaEmbedFilterTranslationTest.php | 90 ++++++++++++++++++++++
 2 files changed, 91 insertions(+)

diff --git a/core/modules/media/src/Plugin/Filter/MediaEmbed.php b/core/modules/media/src/Plugin/Filter/MediaEmbed.php
index ee2f9eb8c7..db8cff0579 100644
--- a/core/modules/media/src/Plugin/Filter/MediaEmbed.php
+++ b/core/modules/media/src/Plugin/Filter/MediaEmbed.php
@@ -172,6 +172,7 @@ public function process($text, $langcode) {
           \Drupal::logger('media')->error('The media item with UUID "@uuid" does not exist.', ['@uuid' => $uuid]);
         }
         else {
+          $media = $this->entityRepository->getTranslationFromContext($media, $langcode);
           $this->applyPerEmbedMediaOverrides($node, $media);
         }
 
diff --git a/core/modules/media/tests/src/Kernel/MediaEmbedFilterTranslationTest.php b/core/modules/media/tests/src/Kernel/MediaEmbedFilterTranslationTest.php
new file mode 100644
index 0000000000..e121b782ee
--- /dev/null
+++ b/core/modules/media/tests/src/Kernel/MediaEmbedFilterTranslationTest.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Drupal\Tests\media\Kernel;
+
+use Drupal\language\Entity\ConfigurableLanguage;
+
+/**
+ * Tests that media embeds are translated based on text (host entity) language.
+ *
+ * @coversDefaultClass \Drupal\media\Plugin\Filter\MediaEmbed
+ * @group media
+ */
+class MediaEmbedFilterTranslationTest extends MediaEmbedFilterTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'language',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    ConfigurableLanguage::createFromLangcode('pt-br')->save();
+    // Reload the entity to ensure it is aware of the newly created language.
+    $this->embeddedEntity = $this->container->get('entity.manager')
+      ->getStorage('media')
+      ->load($this->embeddedEntity->id());
+
+    $this->embeddedEntity->addTranslation('pt-br')
+      ->set('field_media_image',         [
+      'target_id' => $this->image->id(),
+      'alt' => 'pt-br alt',
+      'title' => 'pt-br title',
+    ])->save();
+  }
+
+  /**
+   * Tests that the expected embedded media entity translation is selected.
+   *
+   * @dataProvider providerTranslationSituations
+   */
+  public function testTranslationSelection($text_langcode, $expected_title_langcode) {
+    $text = $this->createEmbedCode([
+      'data-entity-type' => 'media',
+      'data-entity-uuid' => static::EMBEDDED_ENTITY_UUID,
+      'data-view-mode' => 'full',
+    ]);
+
+    $result = $this->processText($text, $text_langcode, ['media_embed']);
+    $this->setRawContent($result->getProcessedText());
+
+    $this->assertSame(
+      $this->embeddedEntity->getTranslation($expected_title_langcode)->field_media_image->alt,
+      (string) $this->cssSelect('img')[0]->attributes()['alt']
+    );
+    // Verify that the filtered text does not vary by translation-related cache
+    // contexts: a particular translation of the embedded entity is selected
+    // based on either the host entity's language, which should require a cache
+    // context to be associated. (The host entity's language may itself be
+    // selected based on some request context, but that is of no concern to
+    // this filter.)
+    $this->assertSame($result->getCacheContexts(), ['timezone', 'user.permissions']);
+  }
+
+  /**
+   * Data provider for testTranslationSelection().
+   */
+  public function providerTranslationSituations() {
+    $embedded_entity_translation_languages = ['en', 'pt-br'];
+
+    foreach (['en', 'pt-br', 'nl'] as $text_langcode) {
+      // The text language (which is set to the host entity's language) must be
+      // respected in selecting a translation. If that translation does not
+      // exist, it falls back to the default translation of the embedded entity.
+      $match_or_fallback_langcode = in_array($text_langcode, $embedded_entity_translation_languages)
+        ? $text_langcode
+        : 'en';
+      yield "text_langcode=$text_langcode ⇒ $match_or_fallback_langcode" => [
+        $text_langcode,
+        $match_or_fallback_langcode,
+      ];
+    }
+  }
+
+}