feat(points): show early-since date in point texts

Refs #44. Core sends earlySince in the games and wallet responses.
COMPLETION_TOO_OLD and the COMPLETED rule show it as {{date}}.

public/i18n/en.json

@@ -1182,7 +1182,7 @@
     "RULES": {
       "STARTED": "5 points when you start a game from your pile and play it (Steam games, once per game).",
       "FINISHED": "30, 50 or 80 points (by time to beat) when you finish a Steam game and there is proof that you played it. Without proof you get 10 points now and the rest once you play the game on Steam after finishing it. With no playtime on record you also get 10 points first, and the rest only with Steam playtime. Once per game.",
-      "COMPLETED": "+40 points when a game is at 100% and you unlocked all achievements. It needs a proven Steam finish (the early 10 points count only once proof arrives) or finish points for a manual edition of the game; a manual game itself never gets this bonus.",
+      "COMPLETED": "+40 points when a game is at 100% and you unlocked all achievements. It needs a proven Steam finish (the early 10 points count only once proof arrives) or finish points for a manual edition of the game, when you reached 100% on or after {{date}}; a manual game itself never gets this bonus.",
       "FINISHED_MANUAL": "15 points when you finish a manual game. At most 3 finishes per week (Monday to Sunday) earn points; manual games and Steam games without proof share this limit. A 4th manual finish in that week earns nothing; a 4th Steam finish without proof still earns the full points once proven.",
       "MONTH": "40 points when your pile is smaller at the end of a month than at its start and you finished a game that month.",
       "STREAK": "20 points for every week in which you finish a game, if you also finished one the week before.",
@@ -1220,6 +1220,7 @@
       "WEEKLY_LIMIT": "weekly limit reached",
       "WEEKLY_LIMIT_NO_PROOF": "weekly limit reached, so no early points; with proof you still get the full finish points",
       "NEEDS_PROVEN_FINISH": "needs a proven Steam finish or finish points for a manual edition first",
+      "COMPLETION_TOO_OLD": "100% reached before {{date}}, too early for these points",
       "NOT_ALL_ACHIEVEMENTS": "not all achievements unlocked"
     },
     "SLOTS": {