app/templates/account/email/invite.html
<p>Dear {{ user.full_name() }},</p>
<p>You are invited to join <b>{{ config.APP_NAME }}</b>!</p>
<p>To set your password, please <a href="{{ invite_link }}">click here</a>.</p>
<p>Alternatively, you can paste the following link in your browser's address bar:</p>
<p>{{ invite_link }}</p>
<p>Once completed, please log in as {{ user.email }} with the password you set.</p>
<p>Sincerely,</p>
<p>The {{ config.APP_NAME }} Team</p>
<p><small>Note: replies to this email address are not monitored.</small></p>