Hi,
this code snippet does not have multilingual support. If you only need the text output in Englisch, you need to modifiy the hardcoded text outputs in /modules/last_update_info/include.php. This could be done with the
Addon File Editor for example.
Echo "Seite zuletzt geändert am: ".date("d.m.Y, H:i",$mod_details[0])." von ".$nameresult[0];
Doc