diff --git a/src/js/_enqueues/admin/site-health.js b/src/js/_enqueues/admin/site-health.js
index 1a31be1b5e..54786dce6f 100644
--- a/src/js/_enqueues/admin/site-health.js
+++ b/src/js/_enqueues/admin/site-health.js
@@ -8,6 +8,10 @@
 
 jQuery( document ).ready( function( $ ) {
 
+	var __ = wp.i18n.__,
+		_n = wp.i18n._n,
+		sprintf = wp.i18n.sprintf;
+
 	var data;
 
 	var clipboard = new ClipboardJS( '.site-health-copy-buttons .copy-button' );
@@ -17,7 +21,7 @@ jQuery( document ).ready( function( $ ) {
 		var $wrapper = $( e.trigger ).closest( 'div' );
 		$( '.success', $wrapper ).addClass( 'visible' );
 
-		wp.a11y.speak( SiteHealth.string.site_info_copied );
+		wp.a11y.speak( __( 'Site information has been added to your clipboard.' ) );
 	} );
 
 	// Accordion handling in various areas.
@@ -52,11 +56,24 @@ jQuery( document ).ready( function( $ ) {
 	function AppendIssue( issue ) {
 		var template = wp.template( 'health-check-issue' ),
 			issueWrapper = $( '#health-check-issues-' + issue.status ),
-			issueCounter = $( '.issue-count', issueWrapper );
+			headline;
 
 		SiteHealth.site_status.issues[ issue.status ]++;
 
-		issueCounter.text( SiteHealth.site_status.issues[ issue.status ] );
+		var count = SiteHealth.site_status.issues[ issue.status ];
+
+		if ( 'critical' === issue.status ) {
+			headline = sprintf( _n( '%s Critical issue', '%s Critical issues', count ), '<span class="issue-count">' + count + '</span>' );
+		} else if ( 'recommended' === issue.status ) {
+			headline = sprintf( _n( '%s Recommended improvement', '%s Recommended improvements', count ), '<span class="issue-count">' + count + '</span>' );
+		} else if ( 'good' === issue.status ) {
+			headline = sprintf( _n( '%s Item with no issues detected', '%s Items with no issues detected', count ), '<span class="issue-count">' + count + '</span>' );
+		}
+
+		if ( headline ) {
+			$( '> h3', issueWrapper ).html( headline );
+		}
+
 		$( '.issues', '#health-check-issues-' + issue.status ).append( template( issue ) );
 	}
 
@@ -127,7 +144,9 @@ jQuery( document ).ready( function( $ ) {
 			}
 		);
 
-		wp.a11y.speak( SiteHealth.string.site_health_complete_screen_reader.replace( '%s', val + '%' ) );
+		// translators: %s: The percentage score for the tests.
+		var text = __( 'All site health tests have finished running. Your site scored %s, and the results are now available on the page.' );
+		wp.a11y.speak( sprintf( text, val + '%' ) );
 	}
 
 	/**
diff --git a/src/wp-admin/includes/class-wp-site-health.php b/src/wp-admin/includes/class-wp-site-health.php
index 85420f4b8d..181d48a19f 100644
--- a/src/wp-admin/includes/class-wp-site-health.php
+++ b/src/wp-admin/includes/class-wp-site-health.php
@@ -46,17 +46,6 @@ class WP_Site_Health {
 
 		$health_check_js_variables = array(
 			'screen'      => $screen->id,
-			'string'      => array(
-				'please_wait'                        => __( 'Please wait...' ),
-				'copied'                             => __( 'Copied' ),
-				'running_tests'                      => __( 'Currently being tested...' ),
-				'site_health_complete'               => __( 'All site health tests have finished running.' ),
-				'site_info_show_copy'                => __( 'Show options for copying this information' ),
-				'site_info_hide_copy'                => __( 'Hide options for copying this information' ),
-				// translators: %s: The percentage score for the tests.
-				'site_health_complete_screen_reader' => __( 'All site health tests have finished running. Your site scored %s, and the results are now available on the page.' ),
-				'site_info_copied'                   => __( 'Site information has been added to your clipboard.' ),
-			),
 			'nonce'       => array(
 				'site_status'        => wp_create_nonce( 'health-check-site-status' ),
 				'site_status_result' => wp_create_nonce( 'health-check-site-status-result' ),
diff --git a/src/wp-admin/site-health-info.php b/src/wp-admin/site-health-info.php
index 1ab31f64af..1d26329909 100644
--- a/src/wp-admin/site-health-info.php
+++ b/src/wp-admin/site-health-info.php
@@ -87,12 +87,12 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 	<div class="site-health-copy-buttons">
 		<div class="copy-button-wrapper">
 			<button type="button" class="button button-primary copy-button" data-clipboard-text="<?php echo esc_attr( WP_Debug_Data::format( $info, 'text' ) ); ?>"><?php _e( 'Copy site info to clipboard' ); ?></button>
-			<span class="success" aria-hidden="true">Copied!</span>
+			<span class="success" aria-hidden="true"><?php _e( 'Copied!' ); ?></span>
 		</div>
 		<?php if ( $english_info ) : ?>
 			<div class="copy-button-wrapper">
 				<button type="button" class="button copy-button" data-clipboard-text="<?php echo esc_attr( WP_Debug_Data::format( $english_info, 'text' ) ); ?>"><?php _e( 'Copy site info to clipboard (English)' ); ?></button>
-				<span class="success" aria-hidden="true">Copied!</span>
+				<span class="success" aria-hidden="true"><?php _e( 'Copied!' ) ?></span>
 			</div>
 		<?php endif; ?>
 	</div>
diff --git a/src/wp-admin/site-health.php b/src/wp-admin/site-health.php
index cc4543e436..7941887ab1 100644
--- a/src/wp-admin/site-health.php
+++ b/src/wp-admin/site-health.php
@@ -91,7 +91,7 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 
 		<div class="site-health-issues-wrapper" id="health-check-issues-critical">
 			<h3>
-				<span class="issue-count">0</span> <?php _e( 'Critical issues' ); ?>
+				<span class="issue-count">0</span> <?php echo _n( 'Critical issue', 'Critical issues', 0 ); ?>
 			</h3>
 
 			<div id="health-check-site-status-critical" class="health-check-accordion issues"></div>
@@ -99,7 +99,7 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 
 		<div class="site-health-issues-wrapper" id="health-check-issues-recommended">
 			<h3>
-				<span class="issue-count">0</span> <?php _e( 'Recommended improvements' ); ?>
+				<span class="issue-count">0</span> <?php echo _n( 'Recommended improvement', 'Recommended improvements', 0 ); ?>
 			</h3>
 
 			<div id="health-check-site-status-recommended" class="health-check-accordion issues"></div>
diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 3a3f57eded..ada3af1064 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -1690,7 +1690,7 @@ function wp_default_scripts( &$scripts ) {
 			)
 		);
 
-		$scripts->add( 'site-health', "/wp-admin/js/site-health$suffix.js", array( 'clipboard', 'jquery', 'wp-util', 'wp-a11y' ), false, 1 );
+		$scripts->add( 'site-health', "/wp-admin/js/site-health$suffix.js", array( 'clipboard', 'jquery', 'wp-util', 'wp-a11y', 'wp-i18n' ), false, 1 );
 
 		$scripts->add( 'updates', "/wp-admin/js/updates$suffix.js", array( 'jquery', 'wp-util', 'wp-a11y' ), false, 1 );
 		did_action( 'init' ) && $scripts->localize(