Connectors: Update the translation when Gutenberg files missing

Follow-up [61825].
Props swissspidy.



git-svn-id: https://develop.svn.wordpress.org/trunk@61845 602fd350-edb4-49c9-b593-d223f7449a82

Author: gziolo

src/wp-admin/options-connectors.php

@@ -20,7 +20,7 @@
 
 if ( ! class_exists( '\WordPress\AiClient\AiClient' ) || ! function_exists( 'wp_options_connectors_wp_admin_render_page' ) ) {
 	wp_die(
-		'<h1>' . __( 'Connectors is not available.' ) . '</h1>' .
+		'<h1>' . __( 'Connectors are not available.' ) . '</h1>' .
 		'<p>' . __( 'The Connectors page requires build files. Please run <code>npm install</code> to build the necessary files.' ) . '</p>',
 		503
 	);