Here are a couple of small enhancements for the awesome extension "Advanced Professional Email Templates" - Found here: Advanced Professional Email Templates -By Opencart Templates

Remove popup warning - Order Info (when changing/selecting templates for Order Status)
apet-remove-warning.ocmod.zip

Add shortcode for { tracking_number } (new default table on oc 3.0.3.7 oc_order_shipment), this can be added per the documentation however does not work when using the shortcode in the comments section of the templates (this will).
apet-tracking-shortcode.ocmod.zip