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The website is officialnightingalemovie.com in case you wanted to take a look at it.

Hello Andrew,

I followed your advice and created a child theme. I made the following changes to my files and I then tried changing the theme to the child theme under Appearance/Themes but it doesn’t seem to work: the Chinese characters are not showing up as red. In fact, the menu becomes unscrambled into just a list of page links :

/harmonic/js/red-zh-char.js

(function($) {
    $('h1, .menu a').each(function() {
    	var text = $(this).html();
    	$(this).html(text.replace(/([\u4E00-\u9FFF])/g, '<span lang="zh">$1</span>'));
  	});
})(jQuery);

/harmonic-child/style.css

/*
Theme Name: Harmonic Child
Theme URI: https://wordpress.com/themes/harmonic/
Description: Harmonic makes your content sing. No matter if you are a band looking to get a record deal, a travel blogger wanting to document your trip around the world or just someone that wants to make their home on WordPress.
Author: Automattic
Author URI: https://wordpress.com/themes/
Template: harmonic
Version: 1.0.11
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Tags: black, white, one-column, two-columns, fluid-layout, responsive-layout, custom-colors, custom-header, custom-menu, editor-style, featured-images, post-formats, rtl-language-support, sticky-post, theme-options, translation-ready
Text Domain: harmonic
*/

span[lang="zh"] {
  color: #dd0c23;
}

/harmonic-child/functions.php

<?php // Opening PHP tag - nothing should be before this, not even whitespace

function theme_enqueue_styles() {

    $parent_style = 'parent-style';

    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'child-style',
        get_stylesheet_directory_uri() . '/style.css',
        array( $parent_style )
    );
}
add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );

function red_zh_char_method() {
	wp_enqueue_script(
		'red-zh-char-script',
		get_stylesheet_directory_uri() . '/js/red-zh-char.js',
		array( 'jquery' )
	);
}
add_action( 'wp_enqueue_scripts', 'red_zh_char_method' );

Any insight as to why that is the case?

^ I am not sure where I should insert the span code into the style.css but since the code worked for my test case I assume it would work for this too.