Translating problem and quote problem

I can't translate this line :
invite.php, line 382 :
window.location='users.php?page=invite_main&updated=true&updatedmsg=" . urlencode('Invite(s) Sent.') . "';

Could you replace it by :
window.location='users.php?page=invite_main&updated=true&updatedmsg=" . urlencode(_e(''Invite(s) Sent.', 'invite')') . "';

And i have a problem with quote, i think it is the line 196 and 197 :
update_site_option( "invite_message_subject", $_POST[ 'invite_message_subject' ] );
update_site_option( "invite_message_content", $_POST[ 'invite_message_content' ] );

Perhaps you could add a stripslashes.