Hi! I have the same problem with localisation. I have checked wordpress settings to be set on necessary russian locale, and also i’ve set php locale to russian too. I have checked if php locale has changed and it is. I see strftime function returns russian names of month, and set_locale also shows me ru_RU. But the pugin still shows the dates in english.
I can even give you an access to my site admin page, so you can see what happends.
Also, I’ve translated your plugin admin page in russian on it’s localisation page on worgpress.org
I think it’s important to solve this problem of localisation for all of the people who wants to use your work!
Thank you!