I totally accept and support the fact Virtualmin uses the correct naming, virtual servers, for the concept that is called "domains", "websites" in other control panel types. After all to host a website on any server you need to create a respective virtual host for a respective domain name on the Apache configuration, so it is in fact a virtual server.
However, after couple years of using Vitualmin/Webmin/Cloudmin, we've come to the conclusion that it is just too much time consuming to overcome the incorrect habit of calling virtual servers as domains, imposed by the whole industry to the absolute majority of regular users. Whatever detailed documentation we provide to customers and refer to the following line on http://www.virtualmin.com/documentation/system/cpanel:
cPanel refers to accounts as "Domains", while Virtualmin uses the term "Virtual Servers".
we have to deal with this naming confusion issue with almost every single new user of Virtualmin. Things especially get confused with customers who use virtual private servers by Cloudmin, even though Cloudmin avoids calling virtual private servers as virtual private servers (using just systems instead), it is quite confusing for some customers to differ virtual servers from virtual private servers .
We understand that we can't ask Virtualmin to change its naming concept, however we really hope that it is possible for the Virtlualmin creators' to make such key strings on Virtualmin UI as "virtual server", "Virtualmin", "Webmin", "sub-server" available for replacing per user likings.
For example, in Drupal world almost anything on Drupal UI is possible to replace with some custom naming. It would be just great if Virtualmin would allow the same. In that case, some Virtualmin users would be able just to replace all the occurrences of virtual server's and sub-server's to domain's and sub-domain's respectively and thus be finally done with customers get constantly confused about correct Virtualmin terminology with incorrect naming, which however and unfortunately has already become industry standards.