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Font Support Cyrillic - Modernize

To change the google font subset, try going to

include/plugin/fontloader.php file.

Around line 219, you'll see

	// include all used font into the website
	add_action('init', 'include_used_font');
	function include_used_font(){
		if(is_admin()) return;
		
		global $all_font;
		$google_font_family = '';
		
		foreach($all_font as $font_name => $font){
		
			if($font['is-used']){
			
				if($font['type'] == 'Cufon'){
				
					wp_deregister_script($font_name);
					if( $font_name == 'Cufon'){
						wp_register_script($font_name, $font['path'], false, '1.0', false);
					}else{
						wp_register_script($font_name, $font['path'], false, '1.0', true);
					}
					wp_enqueue_script($font_name);
					
				}else if($font['type'] == 'Google Font'){
				
					$google_font_family = $google_font_family . str_replace(' ', '+' , $font_name) . ':subset=latin:n,i,b,bi|';
					
				}			
				
			}
			
		}
		
		if(!empty($google_font_family)){
			wp_enqueue_style('Google-Font','http://fonts.googleapis.com/css?family=' . $google_font_family);
		}
	
	}

Try to change to

// include all used font into the website
	add_action('init', 'include_used_font');
	function include_used_font(){
		if(is_admin()) return;
		
		global $all_font;
		$google_font_family = '';
		
		foreach($all_font as $font_name => $font){
		
			if($font['is-used']){
			
				if($font['type'] == 'Cufon'){
				
					wp_deregister_script($font_name);
					if( $font_name == 'Cufon'){
						wp_register_script($font_name, $font['path'], false, '1.0', false);
					}else{
						wp_register_script($font_name, $font['path'], false, '1.0', true);
					}
					wp_enqueue_script($font_name);
					
				}else if($font['type'] == 'Google Font'){
				
					$temp_font_name = str_replace(' ', '+' , $font_name);
					$google_font_family = $temp_font_name . ':300,300italic,400,400italic,700,700italic&subset=latin';
					wp_enqueue_style('Google-Font-' . $temp_font_name,'http://fonts.googleapis.com/css?family=' . $google_font_family);
				
				}				
			}
		}
	
	}

This is an example of the font subset

latin,cyrillic,greek,vietnamese,greek-ext,cyrillic-ext,latin-ext