General: Further improve error messages following [42648].

Props kristastevens, melchoyce.
Fixes #38332 for trunk.


Built from https://develop.svn.wordpress.org/trunk@42719


git-svn-id: http://core.svn.wordpress.org/trunk@42547 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/term.php

@@ -34,7 +34,7 @@ if ( ! in_array( $taxonomy, get_taxonomies( array( 'show_ui' => true ) ) ) ||
 	! current_user_can( 'edit_term', $tag->term_id ) ) {
 
 	wp_die(
-		'<h1>' . __( 'You don&#8217;t have permission to do this.' ) . '</h1>' .
+		'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
 		'<p>' . __( 'Sorry, you are not allowed to edit this item.' ) . '</p>',
 		403
 	);