diff --git a/mod/assign/externallib.php b/mod/assign/externallib.php
index d9777d4a560..36048007e3b 100644
--- a/mod/assign/externallib.php
+++ b/mod/assign/externallib.php
@@ -432,7 +432,7 @@ class mod_assign_external extends external_api {
                         'id' => $module->assignmentid,
                         'cmid' => $module->id,
                         'course' => $module->course,
-                        'name' => $module->name,
+                        'name' => external_format_string($module->name, $context),
                         'nosubmissions' => $module->nosubmissions,
                         'submissiondrafts' => $module->submissiondrafts,
                         'sendnotifications' => $module->sendnotifications,
@@ -528,7 +528,7 @@ class mod_assign_external extends external_api {
                 'id' => new external_value(PARAM_INT, 'assignment id'),
                 'cmid' => new external_value(PARAM_INT, 'course module id'),
                 'course' => new external_value(PARAM_INT, 'course id'),
-                'name' => new external_value(PARAM_TEXT, 'assignment name'),
+                'name' => new external_value(PARAM_RAW, 'assignment name'),
                 'nosubmissions' => new external_value(PARAM_INT, 'no submissions'),
                 'submissiondrafts' => new external_value(PARAM_INT, 'submissions drafts'),
                 'sendnotifications' => new external_value(PARAM_INT, 'send notifications'),
diff --git a/mod/assign/tests/externallib_test.php b/mod/assign/tests/externallib_test.php
index b5a2ea552bf..2f3bcec710a 100644
--- a/mod/assign/tests/externallib_test.php
+++ b/mod/assign/tests/externallib_test.php
@@ -140,6 +140,13 @@ class mod_assign_external_testcase extends externallib_advanced_testcase {
 
         $this->resetAfterTest(true);
 
+        // Enable multilang filter to on content and heading.
+        filter_set_global_state('multilang', TEXTFILTER_ON);
+        filter_set_applies_to_strings('multilang', 1);
+        // Set WS filtering.
+        $wssettings = external_settings::get_instance();
+        $wssettings->set_filter(true);
+
         $category = self::getDataGenerator()->create_category(array(
             'name' => 'Test category'
         ));
@@ -166,7 +173,7 @@ class mod_assign_external_testcase extends externallib_advanced_testcase {
         // Create the assignment module with links to a filerecord.
         $assign1 = self::getDataGenerator()->create_module('assign', array(
             'course' => $course1->id,
-            'name' => 'lightwork assignment',
+            'name' => '<span lang="en" class="multilang">English</span><span lang="es" class="multilang">Español</span>',
             'intro' => 'the assignment intro text here <a href="@@PLUGINFILE@@/intro.txt">link</a>',
             'introformat' => FORMAT_HTML,
             'markingworkflow' => 1,
@@ -221,7 +228,7 @@ class mod_assign_external_testcase extends externallib_advanced_testcase {
         $assignment = $course['assignments'][0];
         $this->assertEquals($assign1->id, $assignment['id']);
         $this->assertEquals($course1->id, $assignment['course']);
-        $this->assertEquals('lightwork assignment', $assignment['name']);
+        $this->assertEquals('English', $assignment['name']);
         $this->assertContains('the assignment intro text here', $assignment['intro']);
         $this->assertNotEmpty($assignment['configs']);
         // Check the url of the file attatched.
@@ -249,7 +256,7 @@ class mod_assign_external_testcase extends externallib_advanced_testcase {
         $assignment = $course['assignments'][0];
         $this->assertEquals($assign1->id, $assignment['id']);
         $this->assertEquals($course1->id, $assignment['course']);
-        $this->assertEquals('lightwork assignment', $assignment['name']);
+        $this->assertEquals('English', $assignment['name']);
         $this->assertArrayNotHasKey('intro', $assignment);
         $this->assertArrayNotHasKey('introattachments', $assignment);
         $this->assertEquals(1, $assignment['markingworkflow']);
@@ -287,7 +294,7 @@ class mod_assign_external_testcase extends externallib_advanced_testcase {
         $assignment = $course['assignments'][0];
         $this->assertEquals($assign1->id, $assignment['id']);
         $this->assertEquals($course1->id, $assignment['course']);
-        $this->assertEquals('lightwork assignment', $assignment['name']);
+        $this->assertEquals('English', $assignment['name']);
         $this->assertArrayNotHasKey('intro', $assignment);
         $this->assertArrayNotHasKey('introattachments', $assignment);
         $this->assertEquals(1, $assignment['markingworkflow']);
diff --git a/mod/data/classes/external.php b/mod/data/classes/external.php
index 649a6336a49..4811a6c5445 100644
--- a/mod/data/classes/external.php
+++ b/mod/data/classes/external.php
@@ -125,7 +125,9 @@ class mod_data_external extends external_api {
                     }
                 }
                 $exporter = new database_summary_exporter($database, array('context' => $context));
-                $arrdatabases[] = $exporter->export($PAGE->get_renderer('core'));
+                $data = $exporter->export($PAGE->get_renderer('core'));
+                $data->name = external_format_string($data->name, $context);
+                $arrdatabases[] = $data;
             }
         }
 
diff --git a/mod/data/tests/externallib_test.php b/mod/data/tests/externallib_test.php
index d2314aae9b6..c49c9be96fb 100644
--- a/mod/data/tests/externallib_test.php
+++ b/mod/data/tests/externallib_test.php
@@ -122,7 +122,8 @@ class mod_data_external_testcase extends externallib_advanced_testcase {
      * Test get databases by courses
      */
     public function test_mod_data_get_databases_by_courses() {
-        global $DB;
+        global $DB, $CFG;
+        require_once($CFG->libdir . '/externallib.php');
 
         $this->resetAfterTest(true);
 
@@ -141,6 +142,8 @@ class mod_data_external_testcase extends externallib_advanced_testcase {
         $record = new stdClass();
         $record->introformat = FORMAT_HTML;
         $record->course = $course1->id;
+        // Set multilang text to check that is properly filtered to "en" only.
+        $record->name = '<span lang="en" class="multilang">English</span><span lang="es" class="multilang">Español</span>';
         $record->intro = '<button>Test with HTML allowed.</button>';
         $database1 = self::getDataGenerator()->create_module('data', $record);
 
@@ -168,6 +171,14 @@ class mod_data_external_testcase extends externallib_advanced_testcase {
         }
         $enrol->enrol_user($instance2, $student->id, $studentrole->id);
 
+        // Enable multilang filter to on content and heading.
+        filter_manager::reset_caches();
+        filter_set_global_state('multilang', TEXTFILTER_ON);
+        filter_set_applies_to_strings('multilang', true);
+        // Set WS filtering.
+        $wssettings = external_settings::get_instance();
+        $wssettings->set_filter(true);
+
         // Create what we expect to be returned when querying the two courses.
         // First for the student user.
         $expectedfields = array('id', 'coursemodule', 'course', 'name', 'comments', 'timeavailablefrom',
@@ -192,6 +203,7 @@ class mod_data_external_testcase extends externallib_advanced_testcase {
             $expected1[$field] = $database1->{$field};
             $expected2[$field] = $database2->{$field};
         }
+        $expected1['name'] = 'English'; // Lang filtered expected.
         $expected1['comments'] = (bool) $expected1['comments'];
         $expected2['comments'] = (bool) $expected2['comments'];
 
diff --git a/mod/lesson/classes/external.php b/mod/lesson/classes/external.php
index d3ff0190b56..fc99b71d0f0 100644
--- a/mod/lesson/classes/external.php
+++ b/mod/lesson/classes/external.php
@@ -143,7 +143,9 @@ class mod_lesson_external extends external_api {
                 $lessonrecord = self::get_lesson_summary_for_exporter($lessonrecord);
 
                 $exporter = new lesson_summary_exporter($lessonrecord, array('context' => $context));
-                $returnedlessons[] = $exporter->export($PAGE->get_renderer('core'));
+                $lesson = $exporter->export($PAGE->get_renderer('core'));
+                $lesson->name = external_format_string($lesson->name, $context);
+                $returnedlessons[] = $lesson;
             }
         }
         $result = array();
diff --git a/mod/lesson/tests/external_test.php b/mod/lesson/tests/external_test.php
index 27ae4ae8ea6..95246491516 100644
--- a/mod/lesson/tests/external_test.php
+++ b/mod/lesson/tests/external_test.php
@@ -99,7 +99,8 @@ class mod_lesson_external_testcase extends externallib_advanced_testcase {
      * Test test_mod_lesson_get_lessons_by_courses
      */
     public function test_mod_lesson_get_lessons_by_courses() {
-        global $DB;
+        global $DB, $CFG;
+        require_once($CFG->libdir . '/externallib.php');
 
         // Create additional course.
         $course2 = self::getDataGenerator()->create_course();
@@ -107,6 +108,7 @@ class mod_lesson_external_testcase extends externallib_advanced_testcase {
         // Second lesson.
         $record = new stdClass();
         $record->course = $course2->id;
+        $record->name = '<span lang="en" class="multilang">English</span><span lang="es" class="multilang">Español</span>';
         $lesson2 = self::getDataGenerator()->create_module('lesson', $record);
 
         // Execute real Moodle enrolment as we'll call unenrol() method on the instance later.
@@ -122,6 +124,14 @@ class mod_lesson_external_testcase extends externallib_advanced_testcase {
 
         self::setUser($this->student);
 
+        // Enable multilang filter to on content and heading.
+        filter_manager::reset_caches();
+        filter_set_global_state('multilang', TEXTFILTER_ON);
+        filter_set_applies_to_strings('multilang', true);
+        // Set WS filtering.
+        $wssettings = external_settings::get_instance();
+        $wssettings->set_filter(true);
+
         $returndescription = mod_lesson_external::get_lessons_by_courses_returns();
 
         // Create what we expect to be returned when querying the two courses.
@@ -157,6 +167,7 @@ class mod_lesson_external_testcase extends externallib_advanced_testcase {
             $expected2[$field] = $lesson2->{$field};
         }
 
+        $expected2['name'] = 'English';  // Lang filtered expected.
         $expectedlessons = array($expected2, $expected1);
 
         // Call the external function passing course ids.