How to change Heading values in A+ Shortcode

I would like to further customize the output of the app_my_appointment shortcode.

This is my current code:
[app_my_appointments order_by="start" strict="1" allow_cancel="1"]

I would like to do two things.

1. Remove the column "Service" from the table
2. Change the heading "Provider" -> "consultant"

Please let me know which file/line this is in.

Thanks,
Judah