Translate Brand as Marca in pt_BR

Brand was just used for DeviceSettings, so it didn't have any problems with
this wrong translation. Now that it's used on product editor, used 'Fabricante'
would make the label duplicated (since there's already a 'Fabricante' there).

Change-Id: I58e66739724c8edad3757a1c0b21d85b6b2787e0