Configure signature for notifications

<!-- old notifications -->
{Patient’s Signature:51}

{Patient’s Signature:53}
<!-- /end old notifications -->



<!-- new notifications with html -->
<img src="{Patient’s Signature:51}" alt="{Name:1} signature #1" />

<img src="{Patient’s Signature:53}" alt="{Name:1} signature #2" />
<!-- /end new notifications with html -->