diff --git a/lib/outputcomponents.php b/lib/outputcomponents.php
index a4c91cffbe6..767d88db0b1 100644
--- a/lib/outputcomponents.php
+++ b/lib/outputcomponents.php
@@ -3480,6 +3480,9 @@ class custom_menu_item implements renderable, templatable {
      */
     protected $lastsort = 0;
 
+    /** @var array Array of other HTML attributes for the custom menu item. */
+    protected $attributes = [];
+
     /**
      * Constructs the new custom menu item
      *
@@ -3489,13 +3492,16 @@ class custom_menu_item implements renderable, templatable {
      * @param int $sort A sort or to use if we need to sort differently [Optional]
      * @param custom_menu_item $parent A reference to the parent custom_menu_item this child
      *        belongs to, only if the child has a parent. [Optional]
+     * @param array $attributes Array of other HTML attributes for the custom menu item.
      */
-    public function __construct($text, moodle_url $url=null, $title=null, $sort = null, custom_menu_item $parent = null) {
+    public function __construct($text, moodle_url $url = null, $title = null, $sort = null, custom_menu_item $parent = null,
+                                array $attributes = []) {
         $this->text = $text;
         $this->url = $url;
         $this->title = $title;
         $this->sort = (int)$sort;
         $this->parent = $parent;
+        $this->attributes = $attributes;
     }
 
     /**
@@ -3505,14 +3511,15 @@ class custom_menu_item implements renderable, templatable {
      * @param moodle_url $url
      * @param string $title
      * @param int $sort
+     * @param array $attributes Array of other HTML attributes for the custom menu item.
      * @return custom_menu_item
      */
-    public function add($text, moodle_url $url = null, $title = null, $sort = null) {
+    public function add($text, moodle_url $url = null, $title = null, $sort = null, $attributes = []) {
         $key = count($this->children);
         if (empty($sort)) {
             $sort = $this->lastsort + 1;
         }
-        $this->children[$key] = new custom_menu_item($text, $url, $title, $sort, $this);
+        $this->children[$key] = new custom_menu_item($text, $url, $title, $sort, $this, $attributes);
         $this->lastsort = (int)$sort;
         return $this->children[$key];
     }
@@ -3645,8 +3652,15 @@ class custom_menu_item implements renderable, templatable {
         $context = new stdClass();
         $context->text = external_format_string($this->text, $syscontext->id);
         $context->url = $this->url ? $this->url->out() : null;
-        $context->title = external_format_string($this->title, $syscontext->id);
+        // No need for the title if it's the same with text.
+        if ($this->text !== $this->title) {
+            // Show the title attribute only if it's different from the text.
+            $context->title = external_format_string($this->title, $syscontext->id);
+        }
         $context->sort = $this->sort;
+        if (!empty($this->attributes)) {
+            $context->attributes = $this->attributes;
+        }
         $context->children = array();
         if (preg_match("/^#+$/", $this->text)) {
             $context->divider = true;
diff --git a/lib/outputrenderers.php b/lib/outputrenderers.php
index 09ad2861604..64ed87f59d4 100644
--- a/lib/outputrenderers.php
+++ b/lib/outputrenderers.php
@@ -3741,13 +3741,21 @@ EOD;
             $strlang = get_string('language');
             $currentlang = current_language();
             if (isset($langs[$currentlang])) {
-                $currentlang = $langs[$currentlang];
+                $currentlangstr = $langs[$currentlang];
             } else {
-                $currentlang = $strlang;
+                $currentlangstr = $strlang;
             }
-            $this->language = $menu->add($currentlang, new moodle_url('#'), $strlang, 10000);
+            $this->language = $menu->add($currentlangstr, new moodle_url('#'), $strlang, 10000);
             foreach ($langs as $langtype => $langname) {
-                $this->language->add($langname, new moodle_url($this->page->url, array('lang' => $langtype)), $langname);
+                $attributes = [];
+                // Set the lang attribute for languages different from the page's current language.
+                if ($langtype !== $currentlang) {
+                    $attributes[] = [
+                        'key' => 'lang',
+                        'value' => str_replace('_', '-', $langtype),
+                    ];
+                }
+                $this->language->add($langname, new moodle_url($this->page->url, ['lang' => $langtype]), null, null, $attributes);
             }
         }
 
diff --git a/lib/templates/custom_menu_item.mustache b/lib/templates/custom_menu_item.mustache
index 544d081669f..bd1dcfbc53b 100644
--- a/lib/templates/custom_menu_item.mustache
+++ b/lib/templates/custom_menu_item.mustache
@@ -39,7 +39,7 @@
     <div class="dropdown-menu" role="menu" id="drop-down-menu-{{uniqid}}" aria-labelledby="drop-down-{{uniqid}}">
         {{#children}}
             {{^divider}}
-                <a class="dropdown-item" role="menuitem" href="{{{url}}}" {{#title}}title="{{{title}}}"{{/title}}>{{{text}}}</a>
+                <a class="dropdown-item" role="menuitem" href="{{{url}}}" {{#title}}title="{{{title}}}"{{/title}} {{#attributes}}{{key}}="{{value}}" {{/attributes}}>{{{text}}}</a>
             {{/divider}}
             {{#divider}}
                 <div class="dropdown-divider" role="presentation"></div>