Originally done for the Avalon skin but can be used for any other. Includes missing icons from the plugin for Afrikaan and Catalan.
Copy and paste all icons from the "Langs" folder to your "C:\ProgramData\Team MediaPortal\MediaPortal\thumbs\OnlineVideos\Langs" folder.
Copy and paste all icons from the "Icons" folder to your "C:\ProgramData\Team MediaPortal\MediaPortal\thumbs\OnlineVideos\Icons" folder.
If you prefer any of the additional choices in the "Icons" folder just re-name the icon to the default name and follow the above instructions.