Add ability to send emails to private domain owners

[maciej-szlosarczyk]

Can be merged already

The following new variables are needed on staging and then production:

# Variables for mailer
mailer_from_address: 'no-reply@internet.ee'
mailer_host: 'example.com'
smtp_address: 'server-hostname'
smtp_port: '25' # 587, 465
smtp_user_name: 'login'
smtp_password: 'pw/key'
# If you need to specify a HELO domain, you can do it here.
smtp_domain: '' # 'domain for HELO checking'
# Use "none" only when for a self-signed and/or wildcard certificate
smtp_openssl_verify_mode: 'peer' # 'none', 'peer', 'client_once','fail_if_no_peer_cert'
# Detects if STARTTLS is enabled in your SMTP server and starts to use it. Defaults to true.
# Set this to false if there is a problem with your server certificate that you cannot resolve.
smtp_enable_starttls_auto: 'true' # 'false'
# If your mail server requires authentication, please change.
smtp_authentication: 'plain' # 'plain', 'login', 'cram_md5'

We most likely can copy the values from registry, except for mailer_from_address and mailer_host, which are new variables. mailer_host is very important to set up properly, otherwise the links in emails direct people to wrong places.

[maciej-szlosarczyk]

JSON for private person now includes additional field, this info should be communicated to voog:

json.contact_form_link

Other than that, this is up for testing, please pay attention to text as there are some gaps in translation, and if you find any translation that is off/missing, make a comment here. I'll add them accordingly.