Hi Luis,
Welcome to the Tryton community. Our discuss forum is the right place to discuss new tryton features.
If you want to add translations for your language, you can do it from on our translation server: There are already some translations for portugues. Feel free to create an account and include more translations if you think we are missing some.
We will be happy if a module to localize tryton is created. It will be great if its contributed to the foundation modules and maintained as standard module. Here are our contribution guidelines.
Before doing any line of code it will be great if you discuss what are the needs for the brazil localization.
I imagine you will need to create a chart of accounts. We have a tutorial which explans How to create your country localization module for accounts It will be great if you can share the links to an official chart that defines the chart of accounts. We use it as base for checking the correctness of the chart.
Are them some other needs that should be included?
If you are interested on hiring somebody we have a list of tryton service providers