Fix: three cases of forgotten exclamation mark as part of HTML-comment-syntax

lang/russian.lang

@@ -996,9 +996,9 @@ backup_categories =               'категорий'
 backup_pages =                    'страниц'
 backup_smilies =                  'смайликов'
 backup_banlists =                 'забаненных'
-backup_bookmarks =                '<-- TODO -->bookmarks'
-backup_read_status =              '<-- TODO -->read status'
-backup_temp_infos =               '<-- TODO -->temporary informations'
+backup_bookmarks =                '<!-- TODO -->bookmarks'
+backup_read_status =              '<!-- TODO -->read status'
+backup_temp_infos =               '<!-- TODO -->temporary informations'
 download_backup_file =            'Скачать файл резервной копии'
 delete_selected =                 'Удалить выбранные'
 restore =                         'Восстановление'