To edit the wording of the message, you will need to alter...
/languages/*/cfrm.php
The two fields are at the end -
$ubbt_lang['BIRTHDAY_SUBJECT'] = "FansFocus.Com: Happy Birthday! from us all at";
$ubbt_lang['BIRTHDAY_BODY'] = "Hi %s,\n\n We at %s would like to wish you a Happy Birthday!";
My subject has already been slightly adjusted
