Use POEDIT to Translate? How?

Dear AMAZING plugin — i love your work.

But i need to translate this plugin. I noticed there is a .pot file. Great!
After creating translation to my language (bulgarian) i saved the .po and .mo files as bg_BG and uploaded them in the same folder (language) as the .pot file.
Switched in the option to use Bulgarian as my plugin language.

And NOTHING changes.

Why? What am i missing? I HAVE to translate it and i love it — i really want to use this plugin, guys!

Please help!