feat(library): add the merge duplicate dialog

public/i18n/en.json

@@ -547,6 +547,22 @@
       "NO": "No"
     }
   },
+  "MERGE": {
+    "OPEN": "Merge duplicate",
+    "TITLE": "Merge with the same game",
+    "HINT": "Find the other entry of \"{{name}}\", e.g. the Steam game or a game added by hand. The merge applies to every user.",
+    "CONFIRM": "Merge \"{{name}}\" and \"{{other}}\" into one game for every user? Libraries with both keep one entry with the status, rating and notes set last. This cannot be undone.",
+    "CONFIRM_BUTTON": "Merge",
+    "BACK": "Back",
+    "DONE": "Games merged",
+    "NO_ACCESS": "Only auditors can merge games.",
+    "ERROR": {
+      "SAME_GAME": "A game cannot be merged with itself.",
+      "STEAM_GAMES": "Two Steam games cannot be merged.",
+      "GAME_NOT_FOUND": "This game is not in ToBePlayed yet, so it cannot be merged.",
+      "OTHER": "The games could not be merged."
+    }
+  },
   "HINT": {
     "CLOSE": "Close",
     "DO_NOT_SHOW_AGAIN": "Do not show again",