Updates to Ukraine movie ratings.

In order to ensure compliance with legal ratings in Ukraine, we will no longer be supporting ratings ДА, ЗА, and 14 as of March 1, 2018. Note that this deadline has changed.

A new rating of 0+ will replace ДА and ЗА, while 14 will be discontinued. Titles will not be removed from the iTunes Store, but make sure you update your internal systems to support these ratings by March 1, 2018.