It could be really nice having portuguese translation in main quest and support center, in my opinion. You are right considering there are big brazilians fc on behemoth and maybe in other servers, there is, also, a brazilian community on Lamia too (Linkshell Brasilis). In Support Center sphere, my worries are if people insult/harass outisde of supported languages, preventing people being punished for it. Main Quest is because I would like to have more comprehension of the story.

I like your idea of being fully translated tho, mainly if they translate directly from japanese, since I heard people notice different dialogues, changing character personality and etc in the japanese to english translation. And I would like to experience the translated japanese dialogues, since the origin of the game is japanese.