Please visit the following link and add your ideas or answers.
http://sharepoint.stackexchange.com/questions/70694/what-is-the-correct-method-to-delete-a-variation-subsite-label-in-sharepoint-2
http://sharepoint.stackexchange.com/questions/70694/what-is-the-correct-method-to-delete-a-variation-subsite-label-in-sharepoint-2
