Fixing function "generate_couser_code" callings

main/admin/course_category.php

@@ -265,7 +265,7 @@ function addNode($code, $name, $canHaveCourses, $parent_id) {
 
     $tree_pos = $row['maxTreePos'] + 1;
 
-    $code = generate_course_code($code);
+    $code = CourseManager::generate_course_code($code);
     Database::query("INSERT INTO $tbl_category(name,code,parent_id,tree_pos,children_count,auth_course_child) VALUES('$name','$code'," . (empty($parent_id) ? "NULL" : "'$parent_id'") . ",'$tree_pos','0','$canHaveCourses')");
 
     updateFils($parent_id);
@@ -287,7 +287,7 @@ function editNode($code, $name, $canHaveCourses, $old_code) {
             return false;
         }
     }
-    $code = generate_course_code($code);
+    $code = CourseManager::generate_course_code($code);
     Database::query("UPDATE $tbl_category SET name='$name', code='$code',auth_course_child='$canHaveCourses' WHERE code='$old_code'");
     $sql = "UPDATE $tbl_course SET category_code = '$code' WHERE category_code = '$old_code' ";
     Database::query($sql);

main/survey/survey.lib.php

@@ -224,7 +224,7 @@ class survey_manager {
 			$course_id = api_get_course_int_id();
 			$sql = "INSERT INTO $table_survey (c_id, code, title, subtitle, author, lang, avail_from, avail_till, is_shared, template, intro, surveythanks, creation_date, anonymous".$additional['columns'].", session_id) VALUES (
 						$course_id,
-						'".Database::escape_string(strtolower(generate_course_code(api_substr($values['survey_code'],0))))."',
+						'".Database::escape_string(strtolower(CourseManager::generate_course_code(api_substr($values['survey_code'],0))))."',
 						'".Database::escape_string($values['survey_title'])."',
 						'".Database::escape_string($values['survey_subtitle'])."',
 						'".Database::escape_string($_user['user_id'])."',