i18n: add follow section to all languages and fix duplicate decks

messages/en-US.json

@@ -460,33 +460,6 @@
       "view": "View"
     }
   },
-  "decks": {
-    "title": "Decks",
-    "subtitle": "Manage your flashcard decks",
-    "newDeck": "New Deck",
-    "enterDeckName": "Enter deck name:",
-    "confirmDelete": "Type \"{name}\" to delete:",
-    "noDecksYet": "No decks yet",
-    "deckInfo": "ID: {id} • {totalCards} cards",
-    "loading": "Loading...",
-    "public": "Public",
-    "private": "Private",
-    "setPublic": "Set Public",
-    "setPrivate": "Set Private",
-    "enterNewName": "Enter new name:",
-    "importApkg": "Import APKG",
-    "exportApkg": "Export APKG",
-    "clickToUpload": "Click to upload .apkg file",
-    "apkgFilesOnly": "APKG files only",
-    "parsing": "Parsing file...",
-    "foundDecks": "Found {count} deck(s)",
-    "deckName": "Deck Name",
-    "back": "Back",
-    "import": "Import",
-    "importing": "Importing...",
-    "exportSuccess": "Deck exported successfully",
-    "goToDecks": "Go to Decks"
-  },
   "decks": {
     "title": "Decks",
     "subtitle": "Manage your flashcard decks",