Please consider gradually transitioning the codebase into English

[marmistrz]

It makes it very difficult to contribute PRs when the code is in Spanish.
Even though you can guess some words if you know English, it's not enough to understand some parts of the code.

[lukasmonk]

I am only working on Lucas ChessR, this is the future of the program.
I'm also trying to translate the labels of variables and functions.