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<?php

function ccd_rename_admin_menu_items( $menu ) {
  // $menu = str_ireplace( 'original name', 'new name', $menu );
  $menu = str_ireplace( 'Dashboard', 'Welcome', $menu );
  $menu = str_ireplace( 'Comments', 'Visitor Feedback', $menu );
  
return $menu;

}
add_filter( 'gettext', 'ccd_rename_admin_menu_items' );
add_filter( 'ngettext', 'ccd_rename_admin_menu_items' );

?>