Issue Summary

When users are added to Bitbucket, the new user receives a mail similar to the one below.

This request - from customer ticket SSP-41309 - is to add the ability to edit the content of this mail to include custom text, images etc. that could be helpful to new users

Steps to Reproduce

NA

Expected Results

Ability to edit the content of the above welcome mail to include custom text, images etc. that could be helpful to new users

Actual Results

See 'Issue summary' above