diff --git a/src/wp-includes/user.php b/src/wp-includes/user.php
index 752b92dcde..6b7a974dbb 100644
--- a/src/wp-includes/user.php
+++ b/src/wp-includes/user.php
@@ -3140,6 +3140,15 @@ function _wp_privacy_send_erasure_fulfillment_notification( $request_id ) {
 		return;
 	}
 
+	// Localize message content for user; fallback to site default for visitors.
+	if ( ! empty( $request->user_id ) ) {
+		$locale = get_user_locale( $request->user_id );
+	} else {
+		$locale = get_locale();
+	}
+
+	$switched_locale = switch_to_locale( $locale );
+
 	/**
 	 * Filters the recipient of the data erasure fulfillment notification.
 	 *
@@ -3250,6 +3259,10 @@ All at ###SITENAME###
 
 	$email_sent = wp_mail( $user_email, $subject, $content );
 
+	if ( $switched_locale ) {
+		restore_previous_locale();
+	}
+
 	if ( $email_sent ) {
 		update_post_meta( $request_id, '_wp_user_notified', true );
 	}
diff --git a/tests/phpunit/data/languages/de_DE.mo b/tests/phpunit/data/languages/de_DE.mo
index b65a14e19c..3698ce3fda 100644
Binary files a/tests/phpunit/data/languages/de_DE.mo and b/tests/phpunit/data/languages/de_DE.mo differ
diff --git a/tests/phpunit/data/languages/de_DE.po b/tests/phpunit/data/languages/de_DE.po
index 4d66b76c10..c3ff771d5e 100644
--- a/tests/phpunit/data/languages/de_DE.po
+++ b/tests/phpunit/data/languages/de_DE.po
@@ -2,13 +2,13 @@
 # This file is distributed under the same license as the 4.9.x package.
 msgid ""
 msgstr ""
-"PO-Revision-Date: 2018-08-13 19:19+0300\n"
+"PO-Revision-Date: 2019-03-27 22:27+0300\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=n != 1;\n"
-"X-Generator: Poedit 2.1.1\n"
-"Project-Id-Version: Development (4.9.x)\n"
+"X-Generator: Poedit 2.2.1\n"
+"Project-Id-Version: Development (5.2.x)\n"
 "Language: de_DE\n"
 "POT-Creation-Date: \n"
 "Last-Translator: \n"
@@ -48,3 +48,8 @@ msgstr "Jetzt %s aktualisieren"
 #: wp-includes/user.php:3445
 msgid "[%1$s] Confirm Action: %2$s"
 msgstr "[%1$s] Aktion bestätigen: %2$s"
+
+#. translators: %s: Site name.
+#: wp-includes/user.php:3175
+msgid "[%s] Erasure Request Fulfilled"
+msgstr "[%s] Löschauftrag ausgeführt"
diff --git a/tests/phpunit/data/languages/es_ES.mo b/tests/phpunit/data/languages/es_ES.mo
index d4c5767eaf..3fe721e001 100644
Binary files a/tests/phpunit/data/languages/es_ES.mo and b/tests/phpunit/data/languages/es_ES.mo differ
diff --git a/tests/phpunit/data/languages/es_ES.po b/tests/phpunit/data/languages/es_ES.po
index 6e03a32de2..40eb0a5e11 100644
--- a/tests/phpunit/data/languages/es_ES.po
+++ b/tests/phpunit/data/languages/es_ES.po
@@ -2,13 +2,13 @@
 # This file is distributed under the same license as the Development (4.9.x) package.
 msgid ""
 msgstr ""
-"PO-Revision-Date: 2018-08-13 19:19+0300\n"
+"PO-Revision-Date: 2019-03-27 22:27+0300\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=n != 1;\n"
-"X-Generator: Poedit 2.1.1\n"
-"Project-Id-Version: Development (4.9.x)\n"
+"X-Generator: Poedit 2.2.1\n"
+"Project-Id-Version: Development (5.2.x)\n"
 "Language: es_ES\n"
 "POT-Creation-Date: \n"
 "Last-Translator: \n"
@@ -44,3 +44,8 @@ msgstr "(Actualmente fijado en: %s)"
 #: wp-includes/user.php:3445
 msgid "[%1$s] Confirm Action: %2$s"
 msgstr "[%1$s] Confirma la acción: %2$s"
+
+#. translators: %s: Site name.
+#: wp-includes/user.php:3175
+msgid "[%s] Erasure Request Fulfilled"
+msgstr "[%s] Solicitud de borrado completada"
diff --git a/tests/phpunit/tests/privacy/wpPrivacySendErasureFulfillmentNotification.php b/tests/phpunit/tests/privacy/wpPrivacySendErasureFulfillmentNotification.php
index 3954970994..01c90ae3bc 100644
--- a/tests/phpunit/tests/privacy/wpPrivacySendErasureFulfillmentNotification.php
+++ b/tests/phpunit/tests/privacy/wpPrivacySendErasureFulfillmentNotification.php
@@ -34,6 +34,24 @@ class Tests_Privacy_WpPrivacySendErasureFulfillmentNotification extends WP_UnitT
 	 */
 	protected static $requester_email;
 
+	/**
+	 * Request user.
+	 *
+	 * @since 5.2.0
+	 *
+	 * @var WP_User $request_user
+	 */
+	protected static $request_user;
+
+	/**
+	 * Test administrator user.
+	 *
+	 * @since 5.2.0
+	 *
+	 * @var WP_User $admin_user
+	 */
+	protected static $admin_user;
+
 	/**
 	 * Create user request fixtures shared by test methods.
 	 *
@@ -43,7 +61,20 @@ class Tests_Privacy_WpPrivacySendErasureFulfillmentNotification extends WP_UnitT
 	 */
 	public static function wpSetUpBeforeClass( $factory ) {
 		self::$requester_email = 'erase-my-data@local.test';
-		self::$request_id      = wp_create_user_request( self::$requester_email, 'erase_personal_data' );
+		self::$request_user    = $factory->user->create_and_get(
+			array(
+				'user_email' => self::$requester_email,
+				'role'       => 'subscriber',
+			)
+		);
+		self::$admin_user      = $factory->user->create_and_get(
+			array(
+				'user_email' => 'admin@local.dev',
+				'role'       => 'administrator',
+			)
+		);
+
+		self::$request_id = wp_create_user_request( self::$requester_email, 'remove_personal_data' );
 		wp_update_post(
 			array(
 				'ID'          => self::$request_id,
@@ -69,6 +100,7 @@ class Tests_Privacy_WpPrivacySendErasureFulfillmentNotification extends WP_UnitT
 	 */
 	public function tearDown() {
 		reset_phpmailer_instance();
+		restore_previous_locale();
 		parent::tearDown();
 	}
 
@@ -276,4 +308,139 @@ class Tests_Privacy_WpPrivacySendErasureFulfillmentNotification extends WP_UnitT
 		$this->assertFalse( metadata_exists( 'post', self::$request_id, '_wp_user_notified' ) );
 	}
 
+	/**
+	 * The function should respect the user locale settings when the site uses the default locale.
+	 *
+	 * @since 5.2.0
+	 * @ticket 44721
+	 * @group l10n
+	 */
+	public function test_should_send_fulfillment_email_in_user_locale() {
+		update_user_meta( self::$request_user->ID, 'locale', 'es_ES' );
+
+		_wp_privacy_send_erasure_fulfillment_notification( self::$request_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertContains( 'Solicitud de borrado completada', $mailer->get_sent()->subject );
+	}
+
+	/**
+	 * The function should respect the user locale settings when the site does not use en_US, the administrator
+	 * uses the site's default locale, and the user has a different locale.
+	 *
+	 * @since 5.2.0
+	 * @ticket 44721
+	 * @group l10n
+	 */
+	public function test_should_send_fulfillment_email_in_user_locale_when_site_is_not_en_us() {
+		update_option( 'WPLANG', 'es_ES' );
+		switch_to_locale( 'es_ES' );
+
+		update_user_meta( self::$request_user->ID, 'locale', 'de_DE' );
+		wp_set_current_user( self::$admin_user->ID );
+
+		_wp_privacy_send_erasure_fulfillment_notification( self::$request_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertContains( 'Löschauftrag ausgeführt', $mailer->get_sent()->subject );
+	}
+
+	/**
+	 * The function should respect the user locale settings when the site is not en_US, the administrator
+	 * has a different selected locale, and the user uses the site's default locale.
+	 *
+	 * @since 5.2.0
+	 * @ticket 44721
+	 * @group l10n
+	 */
+	public function test_should_send_fulfillment_email_in_user_locale_when_admin_and_site_have_different_locales() {
+		update_option( 'WPLANG', 'es_ES' );
+		switch_to_locale( 'es_ES' );
+
+		update_user_meta( self::$admin_user->ID, 'locale', 'de_DE' );
+		wp_set_current_user( self::$admin_user->ID );
+
+		_wp_privacy_send_erasure_fulfillment_notification( self::$request_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertContains( 'Solicitud de borrado completada', $mailer->get_sent()->subject );
+	}
+
+	/**
+	 * The function should respect the user locale settings when the site is not en_US and both the
+	 * administrator and the user use different locales.
+	 *
+	 * @since 5.2.0
+	 * @ticket 44721
+	 * @group l10n
+	 */
+	public function test_should_send_fulfillment_email_in_user_locale_when_both_have_different_locales_than_site() {
+		update_option( 'WPLANG', 'es_ES' );
+		switch_to_locale( 'es_ES' );
+
+		update_user_meta( self::$admin_user->ID, 'locale', 'en_US' );
+		update_user_meta( self::$request_user->ID, 'locale', 'de_DE' );
+
+		wp_set_current_user( self::$admin_user->ID );
+
+		_wp_privacy_send_erasure_fulfillment_notification( self::$request_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertContains( 'Löschauftrag ausgeführt', $mailer->get_sent()->subject );
+	}
+
+	/**
+	 * The function should respect the site's locale when the request is for an unregistered user and the
+	 * administrator does not use the site's locale.
+	 *
+	 * @since 5.2.0
+	 * @ticket 44721
+	 * @group l10n
+	 */
+	public function test_should_send_fulfillment_email_in_site_locale() {
+		update_user_meta( self::$admin_user->ID, 'locale', 'es_ES' );
+		wp_set_current_user( self::$admin_user->ID );
+
+		$request_id = wp_create_user_request( 'erase-user-not-registered@example.com', 'remove_personal_data' );
+		wp_update_post(
+			array(
+				'ID'          => $request_id,
+				'post_status' => 'request-completed',
+			)
+		);
+
+		_wp_privacy_send_erasure_fulfillment_notification( $request_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertContains( 'Erasure Request Fulfilled', $mailer->get_sent()->subject );
+	}
+
+	/**
+	 * The function should respect the site's locale when it is not en_US, the request is for an
+	 * unregistered user, and the administrator does not use the site's default locale.
+	 *
+	 * @since 5.2.0
+	 * @ticket 44721
+	 * @group l10n
+	 */
+	public function test_should_send_fulfillment_email_in_site_locale_when_not_en_us_and_admin_has_different_locale() {
+		update_option( 'WPLANG', 'es_ES' );
+		switch_to_locale( 'es_ES' );
+
+		update_user_meta( self::$admin_user->ID, 'locale', 'de_DE' );
+		wp_set_current_user( self::$admin_user->ID );
+
+		$request_id = wp_create_user_request( 'erase-user-not-registered@example.com', 'remove_personal_data' );
+		wp_update_post(
+			array(
+				'ID'          => $request_id,
+				'post_status' => 'request-completed',
+			)
+		);
+
+		_wp_privacy_send_erasure_fulfillment_notification( $request_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertContains( 'Solicitud de borrado completada', $mailer->get_sent()->subject );
+	}
 }