Update Portuguese(pt_PT) translation. (#492)
Update Portuguese(pt_PT) translation. (#492)

-New strings required translation
-Correcting mistakes
ThePreviousOne/tachiyomi,CarlosEsco/tachiyomi,inorichi/tachiyomi,inorichi/mangafeed,NoodleMage/tachiyomi,NerdNumber9/TachiyomiEH,paronos/tachiyomi,NerdNumber9/TachiyomiEH,inorichi/mangafeed,NoodleMage/tachiyomi,NoodleMage/tachiyomi,inorichi/tachiyomi,paronos/tachiyomi,paronos/tachiyomi,ThePreviousOne/tachiyomi