Update russian language

Hi
I’ve updated the Russian translation for version 2.67. You can pick up here: https://translate.cyberwide.ru/projects/wp-polls/ru/default

(Select ‘all current’ as ‘.po’ and click ‘export’ and save this file to a folder on your computer, do the same again this time selecting ‘.mo’)
https://www.ads-software.com/plugins/wp-polls/