Generic "pt" vs "pt-PT" and "pt-BR"

Now and then, someone requests adding `pt-BR` "Portuguese (Brazil)" to our translation projects at Transifex.

Until now I believed country-specific variants of Portuguese do not differ as much as Chinese ones, so it was more efficient to deduplicate efforts and focus on a single, generic locale:

- https://www.transifex.com/ipfs/dashboard/all_projects/pt/

I don't speak Portuguese myself, so hereby I summon some native speakers active in IPFS community (including managers of js.ipfs.io website) to weight on this :-)

@satazor @hugomrdias @PedroMiguelSS @hacdias @fsdiogo @pgte @daviddias
@agentofuser @dntxos

### Question:

- Are differences between `pt-PT` and `pt-BR` in written language big enough to justify duplicated efforts?
- Would be useful to provide examples of existing translations that would look different in `pt-BR`
- Perhaps its just a few labels that we could work around by creating a generic glossary?