Updated European Portuguese translation file

I made sure that the encodings for the files in question were in ISO-8859-1 instead of utf-8, which they were for some reason according to my text editors (I

I also removed the \uXXXX notation for the special characters and replaced them with the actual chars (é, ç, etc), and, despite github not displaying the files correctly in diffs, Minecraft doesn't mind, so I guess it's fine.