Support for PT_BR translation

[cmotadev]

Hello guys,

This is a first version of Brazilian Portuguese geonode-mapstore-client.

I don't know if it is 100% completed, but it covers a lot of terms, and it was enhanced from original Portuguese translation. This was based on geonode 4.4.3.

Please embed this translation as a "Suported Translations" on GeoNode, as below, on geonode's settings.py.

https://github.com/GeoNode/geonode/blob/6761e67bcdbfd4b1d9416fcf093a19333b3d0129/geonode/settings.py#L1483-L1497

I'm opening this PR here, but it will be referenced on geonode repo, too.

[cmotadev]

PR below
#2261

[allyoucanmap]

Reopening the issue, still missing this part #2261 (comment)