Placeholders translation for GK_Contact plug

Hi, looking for a way to translate placeholders in GK_Contact plugin for here: http://bozhenko.guru/#contact
As far as I understood simply translating en-GB.tpl_gk_john_s.ini into ru-RU.tpl_gk_john_s.ini doesn't do it and I can't find lang pack for the plug itself...
Which file to I tweak? Thanks.

Hi,
you forget that each plugin has its own translation language file.
administrator\language\en-GB\en-GB.plg_system_gkcontact.ini

Hi,
you forget...

One of my teachers used to say "It may be difficult, if you never knew something and than all of a sudden forgot it!"
But thanks for the answer.
Just in case you might ever need it translated: https://yadi.sk/d/IaxOrOAzc6jov

Thanks for .ini file, I will send to our developer.