Copy project settings from another file

[machinewrapped]

Added the option to copy project-specific settings, including translator instructions, from another project file.

I have removed the "gpt_model" setting from project-specific settings, to make things simpler. The translator will always use the global setting now instead. It may come back in future, since saving the model to use on a per-project basis does make sense.

As a result, the "Translator Settings" button is now "Edit Instructions", since that is its only remaining function.

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This discussion was created from the release Copy project settings from another file.