WP_Widget_Custom_HTML::enqueue_admin_scripts()

	public function enqueue_admin_scripts() {
		$settings = wp_enqueue_code_editor( array(
			'type' => 'text/html',
			'codemirror' => array(
				'indentUnit' => 2,
				'tabSize' => 2,
			),
		) );

		wp_enqueue_script( 'custom-html-widgets' );
		if ( empty( $settings ) ) {
			$settings = array(
				'disabled' => true,
			);
		}
		wp_add_inline_script( 'custom-html-widgets', sprintf( 'wp.customHtmlWidgets.init( %s );', wp_json_encode( $settings ) ), 'after' );

		$l10n = array(
			'errorNotice' => array(
				/* translators: %d: error count */
				'singular' => _n( 'There is %d error which must be fixed before you can save.', 'There are %d errors which must be fixed before you can save.', 1 ),
				/* translators: %d: error count */
				'plural' => _n( 'There is %d error which must be fixed before you can save.', 'There are %d errors which must be fixed before you can save.', 2 ), // @todo This is lacking, as some languages have a dedicated dual form. For proper handling of plurals in JS, see https://core.trac.wordpress.org/ticket/20491.
			),
		);
		wp_add_inline_script( 'custom-html-widgets', sprintf( 'jQuery.extend( wp.customHtmlWidgets.l10n, %s );', wp_json_encode( $l10n ) ), 'after' );
	}