Game profile: granular IGDB platforms and free-game badge

- List IGDB platform names verbatim (Windows, MacOS) instead of
  coarse buckets; fall back to Steam OS flags and hardware
  distributors only when IGDB has none
- Show a Free badge instead of prices when best price is zero

lib/i18n/dictionaries/tr.json

@@ -37,6 +37,7 @@
             "links": "Bağlantılar",
             "reviews": "İncelemeler",
             "prices": "Fiyatlar",
+            "free": "Ücretsiz",
             "bestPrice": "En İyi Fiyat",
             "historyLow": "Tarihi En Düşük",
             "allPrices": "ITAD",