Toolbar: Allow the Learn WordPress link to be localized.

The Learn WordPress website is supposed to automatically redirect to the correct locale according to the browser's language settings, however that may not work as expected in some cases.

This commit brings consistency with the other WordPress.org links, which can be localized as appropriate.

Follow-up to [56720].

Props timse201, ruturajraval2305, yogeshbhutkar, ajayghaghretiya-multidots, swissspidy, sabernhardt, im3dabasia1, mukesh27.
Fixes #62459.
Built from https://develop.svn.wordpress.org/trunk@59425


git-svn-id: http://core.svn.wordpress.org/trunk@58811 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/admin-bar.php

@@ -205,7 +205,7 @@ function wp_admin_bar_wp_menu( $wp_admin_bar ) {
 			'parent' => 'wp-logo-external',
 			'id'     => 'learn',
 			'title'  => __( 'Learn WordPress' ),
-			'href'   => 'https://learn.wordpress.org/',
+			'href'   => __( 'https://learn.wordpress.org/' ),
 		)
 	);