TinyMCE, link check:

- Use `wp.a11y.speak()` to announce bad URLs.
- Do not add a title to the link toolbar.
- Better error message.

Props afercia, azaozz.
See #36638.
Built from https://develop.svn.wordpress.org/trunk@38126


git-svn-id: http://core.svn.wordpress.org/trunk@38067 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-editor.php

@@ -1065,7 +1065,7 @@ final class _WP_Editors {
 			'Ctrl + letter:' => __( 'Ctrl + letter:' ),
 			'Letter' => __( 'Letter' ),
 			'Action' => __( 'Action' ),
-			'Invalid host name.' => __( 'Invalid host name.' ),
+			'Warning: the link has been inserted but the destination cannot be reached.' => __( 'Warning: the link has been inserted but the destination cannot be reached.' ),
 			'To move focus to other buttons use Tab or the arrow keys. To return focus to the editor press Escape or use one of the buttons.' =>
 				__( 'To move focus to other buttons use Tab or the arrow keys. To return focus to the editor press Escape or use one of the buttons.' ),
 			'When starting a new paragraph with one of these formatting shortcuts followed by a space, the formatting will be applied automatically. Press Backspace or Escape to undo.' =>