I don't know,calling her Mrs Heavans it's kinda a turn off
It's up to you if it's this much of a turn-off that you'd want to change this. You can replace "Mrs. Heavens" the same way as I showed you with "Nicole".
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some more info about how to create and edit translate files. As I said, it is super easy, and once you know how to do it, the process will probably only takes you a few minutes, since you can just search and replace. Atom supports searching and replacing multiple lines, so you could easily do something like this:
As
Mytez said, calling her by her last name is part of the story, so you shouldn't change "Mrs. Heavens" to her first name, as you'd probably only confuse yourself when playing.