@fxa90id, this looks great! I have some small suggestions for the email subject body.

Subject: "{{ friend }} created a Mozillians profile"

Body:
"Hi {{ inviter }},

Thanks to you, your friend {{ friend }} created a profile on mozillians.org.

Take a look at their profile: {{ profile }}"

It would be great to have a blank line separating each line too. r+ with changes :)