diff --git a/src/js/_enqueues/wp/theme-plugin-editor.js b/src/js/_enqueues/wp/theme-plugin-editor.js
index 84695dfefa..71fd3c1811 100644
--- a/src/js/_enqueues/wp/theme-plugin-editor.js
+++ b/src/js/_enqueues/wp/theme-plugin-editor.js
@@ -10,17 +10,10 @@ if ( ! window.wp ) {
 
 wp.themePluginEditor = (function( $ ) {
 	'use strict';
-	var component, TreeLinks;
+	var component, TreeLinks,
+		__ = wp.i18n.__, _n = wp.i18n._n, sprintf = wp.i18n.sprintf;
 
 	component = {
-		l10n: {
-			lintError: {
-				singular: '',
-				plural: ''
-			},
-			saveAlert: '',
-			saveError: ''
-		},
 		codeEditor: {},
 		instance: null,
 		noticeElements: {},
@@ -75,7 +68,7 @@ wp.themePluginEditor = (function( $ ) {
 
 		$( window ).on( 'beforeunload', function() {
 			if ( component.dirty ) {
-				return component.l10n.saveAlert;
+				return __( 'The changes you made will be lost if you navigate away from this page.' );
 			}
 			return undefined;
 		} );
@@ -233,7 +226,7 @@ wp.themePluginEditor = (function( $ ) {
 			var notice = $.extend(
 				{
 					code: 'save_error',
-					message: component.l10n.saveError
+					message: __( 'Something went wrong. Your change may not have been saved. Please try again. There is also a chance that you may need to manually fix and upload the file over FTP.' )
 				},
 				response,
 				{
@@ -375,20 +368,23 @@ wp.themePluginEditor = (function( $ ) {
 		 * @return {void}
 		 */
 		codeEditorSettings.onUpdateErrorNotice = function onUpdateErrorNotice( errorAnnotations ) {
-			var message, noticeElement;
+			var noticeElement;
 
 			component.submitButton.toggleClass( 'disabled', errorAnnotations.length > 0 );
 
 			if ( 0 !== errorAnnotations.length ) {
-				if ( 1 === errorAnnotations.length ) {
-					message = component.l10n.lintError.singular.replace( '%d', '1' );
-				} else {
-					message = component.l10n.lintError.plural.replace( '%d', String( errorAnnotations.length ) );
-				}
 				noticeElement = component.addNotice({
 					code: 'lint_errors',
 					type: 'error',
-					message: message,
+					message: sprintf(
+						/* translators: %s: Error count. */
+						_n(
+							'There is %s error which must be fixed before you can update this file.',
+							'There are %s errors which must be fixed before you can update this file.',
+							errorAnnotations.length
+						),
+						String( errorAnnotations.length )
+					),
 					dismissible: false
 				});
 				noticeElement.find( 'input[type=checkbox]' ).on( 'click', function() {
diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 1b44067c8a..7ebb7e3a43 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -1013,25 +1013,7 @@ function wp_default_scripts( $scripts ) {
 	$scripts->add( 'htmlhint-kses', '/wp-includes/js/codemirror/htmlhint-kses.js', array( 'htmlhint' ) );
 	$scripts->add( 'code-editor', "/wp-admin/js/code-editor$suffix.js", array( 'jquery', 'wp-codemirror', 'underscore' ) );
 	$scripts->add( 'wp-theme-plugin-editor', "/wp-admin/js/theme-plugin-editor$suffix.js", array( 'wp-util', 'wp-sanitize', 'jquery', 'jquery-ui-core', 'wp-a11y', 'underscore' ) );
-	did_action( 'init' ) && $scripts->add_inline_script(
-		'wp-theme-plugin-editor',
-		sprintf(
-			'wp.themePluginEditor.l10n = %s;',
-			wp_json_encode(
-				array(
-					'saveAlert' => __( 'The changes you made will be lost if you navigate away from this page.' ),
-					'saveError' => __( 'Something went wrong. Your change may not have been saved. Please try again. There is also a chance that you may need to manually fix and upload the file over FTP.' ),
-					'lintError' => array(
-						/* translators: %d: Error count. */
-						'singular' => _n( 'There is %d error which must be fixed before you can update this file.', 'There are %d errors which must be fixed before you can update this file.', 1 ),
-						/* translators: %d: Error count. */
-						'plural'   => _n( 'There is %d error which must be fixed before you can update this file.', 'There are %d errors which must be fixed before you can update this file.', 2 ),
-						// @todo This is lacking, as some languages have a dedicated dual form. For proper handling of plurals in JS, see #20491.
-					),
-				)
-			)
-		)
-	);
+	$scripts->set_translations( 'wp-theme-plugin-editor' );
 
 	$scripts->add( 'wp-playlist', "/wp-includes/js/mediaelement/wp-playlist$suffix.js", array( 'wp-util', 'backbone', 'mediaelement' ), false, 1 );