Hello,
I expect that many people will continue to use the term "actress" for females in the profession. I notice that the Amy Johnson discussion raises that.
A couple of years ago I got to review an elementary English textbook being distributed in very large numbers in North India. It was an original work seemingly derived from public domain content and had a section on gendered nouns, including "negro" and "negress". I looked at the time for a style guide on best practices for gendered term and I could not find anything clear when I looked then, but obviously there is bad information to be found online among the public domain texts and it really grated on me that new print works were being distributed to teach children such things.
We might not be so far from the day when someone could publish a Wikipedia Manual of Style and expect it to be an authoritative text. I am not sure what the right answer is in this case but whatever you find please consider noting on the manual of style because this question will come up again.
Thanks for sharing.