Revert "Temporarily remove courses catalog's random pick to avoid bug with pagination - refs #7273"

This reverts commit 2632e1db4d.

Conflicts:
	main/template/default/auth/courses_categories.php

main/template/default/auth/courses_categories.php

@@ -138,7 +138,7 @@ $userInfo = api_get_user_info();
              * it, as this can considerably slow down your system
              */
             if (!empty($browse_course_categories)) {
-                //echo '<a class="btn" href="'.api_get_self().'?action=display_random_courses">'.get_lang('RandomPick').'</a><br /><br />';
+                echo '<a class="btn" href="'.api_get_self().'?action=display_random_courses">'.get_lang('RandomPick').'</a><br /><br />';
             ?>
             </ul>
         </div>

main/template/default/auth/sessions_catalog.tpl

@@ -71,7 +71,7 @@
                 {% endif %}
 
                 {% if coursesCategoriesList is not empty %}
-                    <!-- a class="btn" href="{{ api_get_self }}?action=display_random_courses">{{ 'RandomPick' | get_lang }}</a-->
+                    <a class="btn" href="{{ api_get_self }}?action=display_random_courses">{{ 'RandomPick' | get_lang }}</a>
                 {% endif %}
             </div>