In Lyx, how to change "Part I" with some other text

Question

I'm using the article class. When creating a new part, I would like to change "Part 1" to "Experiment 1", "Part 2" to "Experiment 2" and so on, followed by my part title. How can I do that?

I've found this question, but the answers didn't work for me
In Lyx, how to change the "Part" section to "Chapter"?

Thank you! :)

Edit:
This is my preamble:

usepackage[version=3]{mhchem}
date{}
usepackage{fancyhdr}
usepackage{titlesec}
setlength{headheight}{15.2pt}
pagestyle{fancy}
renewcommand{headrulewidth}{0pt}
renewcommand{footrulewidth}{0pt}
lhead[]{}
rhead[]{}
lhead[]{}
rhead[]{}
lfoot[thepage]{}
rfoot[]{thepage}
renewcommand{partname}{Experiment}%added later

EDIT:
The renewcommand{partname}{Experiment} line works fine with the language set to English, but i need to make this work in other languages, because now if I add the toc it's called "Contents", while I need an italian "Indice".

Edit:
self-answer (for all who may find this helpful): use renewcommandcontentsname{Indice} to change "Content" to "Indice" or whatever.

Werner · Accepted Answer

LyX just provides an interface (or front end) to LaTeX. So, while you may see

Part I  Some text

as your title inside the editor view, the LaTeX code associated with it

part{Some text}

will output

Experiment I  Some text

if you add

renewcommand{partname}{Experiment}

to your preamble (Document > Settings... > LaTeX Preamble). If you wish to change this in the editor as well (so the visual matches the PDF output), you need to edit the stdsections.inc layout file; specifically the part style:

Style Part
  Category               Section
  Margin                 Dynamic
  LabelString            "Part thepart"
  LabelType              Counter
  ...

You would have to update LabelString to read "Experiment thepart" instead.

Biagio Di Micco · Answer

You need to change the babel settings for your language, in your case is italian so an example is:
addtocaptionsitalian{%
renewcommand{partname}%
{Volume}%
}

In Lyx, how to change "Part I" with some other text

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