Hi, there is no way for you to edit the text in the button via an Out-Of-Box approach. The option we recommend will be using Power Apps to customize the list form. Then you can add a custom submit button to the list form.
Here are some examples for your references:
https://www.youtube.com/watch?v=Badj3_T8zAw
https://www.c5insight.com/Resources/Blog/tabid/148/entryid/885/powerapps-how-to-customize-save-and-cancel-buttons.aspx
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