plugin.getPathToLangFiles
The 'getPathToLangFiles' function retrieves the direcotry containing the language .INI files.
- Prototype: plugin.getPathToLangFiles();
 - Parameters: None.
 - Return Value: path to the directory where language files reside; By default setup, it's './lang'.
 - Example: 
alert(plugin.getPathToLangFiles());