feat(library): ask whether a game is finished

public/i18n/en.json

@@ -220,7 +220,11 @@
     "REMOVE_BACKGROUND": "Remove background",
     "SET_BANNER": "Use as banner",
     "ALL_UNLOCKED": "You unlocked every achievement of this game.",
-    "SET_COMPLETED": "Set to 100 %"
+    "SET_COMPLETED": "Set to 100 %",
+    "FINISHED_ENDING": "You unlocked \"{{achievement}}\", the end of the story. Did you finish the game?",
+    "FINISHED_PLAYTIME": "You played {{played}}; most players finish this game in {{normal}}. Did you finish it?",
+    "SET_FINISHED": "Mark as finished",
+    "NOT_YET": "Not yet"
   },
   "LANDING": {
     "STATS_TITLE": "Community stats",