For [ru] translated is "Сеанс", is not right. Must be "Сессия Xfce". Please, correct it.
Translations get handled at Transifex, http://docs.xfce.org/contribute/translate/start has the details.
Closing bug, please file bugs @ transifex or bring the issue up on the i18n mailing list (https://mail.xfce.org/mailman/listinfo/xfce-i18n) so translators can correct these issues! I don't know the rules for joining teams, but you may want to look into joining the transifex Russian team to help out.