gistfile1.php

<?php
/*
Plugin Name: Apex Add Latin-extended
Plugin URI: http://arunas.co
Description: Add Latin-ext to Google fonts in Apex theme
Author: Arūnas Liuiza
Version: 0.1.0
Author URI: http://arunas.co
*/


add_action( 'wp_enqueue_scripts', 'arunas_apex_latin_ext', 100 );

function arunas_apex_latin_ext() {
	// removes default Google Fonts
	wp_dequeue_style( 'ct-apex-google-fonts' );
	// registers Google Fonts with latin-ext
	wp_register_style( 'ct-apex-google-fonts', '//fonts.googleapis.com/css?family=Open+Sans|Satisfy&subset=latin,latin-ext' );
	// enqueues Google Fonts
	wp_enqueue_style( 'ct-apex-google-fonts' );
}