Removed duplicates I18N strings (related to issue #9210) (#12679)

* Removed duplicated string from `generic.json`

* Removed duplicated string from `npc.json`

website/common/locales/en/generic.json

@@ -181,7 +181,6 @@
   "habitica_official": "Habitica Official",
   "academics": "Academics",
   "advocacy_causes": "Advocacy + Causes",
-  "creativity": "Creativity",
   "entertainment": "Entertainment",
   "finance": "Finance",
   "health_fitness": "Health + Fitness",

website/common/locales/en/npc.json

@@ -54,7 +54,6 @@
   "shops": "Shops",
   "custom": "Custom",
   "wishlist": "Wishlist",
-  "items": "Items",
   "wrongItemType": "The item type \"<%= type %>\" is not valid.",
   "wrongItemPath": "The item path \"<%= path %>\" is not valid.",
   "unpinnedItem": "You unpinned <%= item %>! It will no longer display in your Rewards column.",