For transliteration now I’m using Serbian Transliteration of Cyrillic to Latin Script by Predrag Supurovi?.Firstly I have installed Serbian in Latin Script by Kimmo Suominen but I’ve noticed that this plugin haven’t transliterated everything on the site like you’ve noticed.This screenshot was made when I had this plugin installed.Then I tried Serbian Transliteration of Cyrillic to Latin Script by Predrag Supurovi? and everything was ok except Facebook comments.You can see it here: https://www.bodyfit-ns.com/vezbe/vezbe-za-savrsene-ruke-i-grudi/
That’s why I’ve posted this question here hoping that author of the Facebook comments, Alex Moss can offer some solution.
Thanks Milan for fast reply!