Merge branch '1.11.x' of github.com:chamilo/chamilo-lms into 1.11.x

main/exercise/exercise.class.php

@@ -3156,7 +3156,7 @@ class Exercise
                     'class' => 'ajax btn btn-default',
                     'data-title' => Security::remove_XSS(get_lang('Comment')),
                     'data-size' => 'md',
-                    'id' => "button_$question_id"
+                    'id' => "button_$question_id",
                 ]
             );
             $html .= '<br />';