show self-extended info in a setting box

Author: ferishili

lang/en/local_och5p.php

@@ -49,6 +49,7 @@
 $string['setting_extended_themes_header'] = 'Themes';
 $string['setting_extended_themes_noavailable'] = 'No themes available to extend.';
 $string['setting_extended_themes_selfextended'] = 'The following themes already contain the Opencast extension by themselves and can be used directly: <ul><li>{$a}</li></ul>';
+$string['setting_extended_themes_selfextended_label'] = 'Self-extended themes';
 $string['setting_lti_header'] = 'LTI Configuration';
 $string['setting_lti_header_desc'] = 'When "Securing Static Files" in Opencast configuration is enabled, it is necessary to use LTI authentication.';
 $string['setting_uselti'] = 'Enable LTI authentication';

settings.php

@@ -56,10 +56,16 @@
     }
 
     if (!empty($selfextendedthemes)) {
-        \core\notification::add(
+        $selfextendedthemesinfo = \html_writer::div(
             get_string('setting_extended_themes_selfextended', 'local_och5p', implode('</li><li>', $selfextendedthemes)),
-            \core\notification::INFO
+            'box py-3 generalbox alert alert-info'
         );
+        $infodescsetting = new admin_setting_description(
+            'local_och5p/self_extended_themes',
+            get_string('setting_extended_themes_selfextended_label', 'local_och5p'),
+            $selfextendedthemesinfo
+        );
+        $settings->add($infodescsetting);
     }
 
     $extendedthemessetting = new admin_setting_configempty('local_och5p/extended_themes',