Hi Viktor,
I think there is no need of that because I've edited mk.php and then I've noticed when I used:
1. $l['w_page'] = $lang['page']; OR
2. $l['w_page'] = 'страна';
that the plugin reads the en/mk version of strana/страна from the language db in the first option, or reads just страна in the second option but the problem in either ways is in the encoding of the mk version: страна. And I can't figure it out why UTF-8 can't encode it