does Brazilian use any other characters besides a-z? The tpt font only has characters for those, and if it has any other letters you need to make those yourself (which could be hard)

There is no simple way to translate the game at all, you have to compile the game, and search out every line of text scattered in many places throughout the code. Then translate it and make sure it all fits in the boxes they are designed for.

There is https://github.com/mniip/The-Powder-Toy/tree/unicode , which if finished would support more characters. What it doesn't support is translations though, but you could have a fork of the game that supports any language this way until we added some global translation thing.