That text is (incorrectly) hard-coded into our JomSocial Social-Profile plugin. You can edit the text in the /plugins/socialprofiles/jomsocial/jomsocial.php file. At around line 545, you'll see the following block with the offending text:
$stream = new stdClass();
$stream->actor = $actor;
$stream->headline = $actorLink . " had a status update on Facebook";
$stream->message = $act->title;
I took a note to add that string to a language file and that *should* make it into the v5.1 release next week.
I hope that helps, but if you run into any other issues, just let us know.
Thanks,
Alex