[4.0] Fix #21357 when multilanguage is implemented (#21391)

* [4.0] Fix: Associations tab should display only one Notice when item
edited is set to ALL languages

* correcting my local branch

* [4.0] Fix 21357 when multilang is implemented

Author: infograf768

administrator/components/com_content/View/Article/HtmlView.php

@@ -21,6 +21,7 @@
 use Joomla\CMS\Component\ComponentHelper;
 use Joomla\CMS\Factory;
 use Joomla\Component\Content\Administrator\Helper\PreviewHelper;
+use Joomla\CMS\Language\Multilanguage;
 
 /**
  * View to edit an article.
@@ -198,9 +199,10 @@ function (Toolbar $childBar) use ($checkedOut, $itemEditable, $canDo)
 				$linkSuffix = '&layout=modal&client_id=0&tmpl=component&' . Session::getFormToken() . '=1';
 				$linkItem   = 'index.php?option=com_menus&view=item' . $linkSuffix;
 
-				if (isset($this->element['language']))
+				// Force the language of the menu item when multilang is implemented
+				if (Multilanguage::isEnabled() && $this->form->getValue('language') !== '*')
 				{
-					$linkItem .= '&forcedLanguage=' . $this->element['language'];
+					$linkItem .= '&forcedLanguage=' . $this->form->getValue('language');
 				}
 
 				$urlNew  = $linkItem . '&task=item.add';