As you already now I’m not a programmer.  I can barely read the code and experiment with it.
At one day while reading the code for !flip command I had realized that with just 3 changed words I can change the output of this command into my national language.
That makes me think I could change all the modules into my language so it will be easier for my fellow guild mates to understand (since not all of them are fluent in English).
And then I the upgrade of bot shows up and I understand that I would have to repeat all the work with translation each time the upgrade will come.

Could you think of a method to store the translated versions of all the bot output messages somewhere and tell the bot to use them instead of those default?

As far as I can imagine that would be a huge change, at some points it could be even impossible. But maybe you will come with some solution?

That said, if anyone with the knowledge required and time available to actually do this, i'm more than certain that it would be most welcome. However the huge task of modifying the codebase to support multiple languages is only half the work. The translations needs to be created, and maintained as well. For every change made to the codebase in terms of strings output, all translations needs to be updated.