[DevEx]: Translation guidelines for future translators

[Posoroko]

Improvement Summary

Give informations and indications for translating the game

Detailed Description

I've been working on the French translation for a few days now and I had to check some things with @itsalaidbacklife to understand the intention behind certain words and expressions. I drafted a little document that goes over the terminology used in the game to guide future translators.

It's a draft meant to be corrected/completed by people with more knowledge about the game.

I'll make a draft PR, you guys can see if it's relevant.