1. Portugales language seems must have international name as 'pt', so you should use here (as name) this name, not Portugues, just because now realized functional - auto definition of current language, and if it installed in dolphin - language automatically switched. For example, you have 'en-us' encripton, so you can install 'en-us' language, and other international standards (languages)
so about permission - need set 777 to 'langs' folder :)