Added wiki link

Author: cvasseng

CHANGELOG.md

@@ -5,7 +5,7 @@
   * Fixed issue with save/load project
   * Fixed scrolling in SimpleEditor
   * Improved the API for the doneEditing callback in modal editor
-  * Expanded localization system
+  * Expanded localization system [see wiki](https://github.com/highcharts/highcharts-editor/wiki/Localization)
   * Updated inline API documentation
   * Simple editor features can now be toggled
   * General stability enhancements and bug fixes