message: amount -> stack size
diff: "SortByBasePower": "Base power (D2 only)",
  "SortByClassType": "Required Class",
  "SortByPrimary": "Power level",
  - "SortByAmount": "Amount",
  + "SortByAmount": "Stack Size",
  "SortByRarity": "Rarity",
  "SortByRating": "Community Rating or Armor Quality",
  "SortByType": "Type",
  