Problems with the Language configuration

[rigin]

I do the website in which languages in Front-end and Back-end differ.
In Back-end Russian is established, and in Front-end it is switched -off.

Arise the prevention, "There is no ru-RU flag for the ru-RU language."
And after updating to VirtueMart 3.0.14 there is a message.

Notice: Undefined index: ru-RU in /******/administrator/components/com_virtuemart/helpers/config.php on line 948