Ticket #20646: 20646.patch

wp-admin/custom-header.php

@@ -955 +955 @@
                                 'file' => $post->ID
                         ), admin_url('themes.php')));
 
-                        $form_fields['buttons'] = array( 'tr' => '<tr class="submit"><td></td><td><a data-location="' . $href . '" class="wp-set-header">' . _( 'Set as header' ) . '</a></td></tr>' );
+                        $form_fields['buttons'] = array( 'tr' => '<tr class="submit"><td></td><td><a data-location="' . $href . '" class="wp-set-header">' . __( 'Set as header' ) . '</a></td></tr>' );
                         $form_fields['context'] = array( 'input' => 'hidden', 'value' => 'custom-header' );
                 }