feat: replace all user-facing Russian strings with English

Empty Russian and Chinese locale files so English is used regardless
of client language. Translate all CustomGameEventManager error messages,
SendCustomMessage calls, and deck/card UI strings to English.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/vscripts/card_catalog.lua

@@ -844,15 +844,15 @@ end
 function ____exports.getDeckBuilderUnlockRequiredMessage(self, unlockCardId)
     local id = math.floor(__TS__Number(unlockCardId))
     if id == ____exports.FROSTMOURNE_CARD_ID then
-        return "Нужна купленная карта «Фростморн»"
+        return "Requires purchased Frostmourne card"
     end
     if id == ____exports.WISH_CARD_ID then
-        return "Нужна купленная карта «Карта желания»"
+        return "Requires purchased Wish card"
     end
     if id == ____exports.MANA_SURGE_CARD_ID then
-        return "Нужна купленная карта «Буйство маны»"
+        return "Requires purchased Mana Surge card"
     end
-    return "Нужна купленная родительская карта"
+    return "Requires purchased parent card"
 end
 function ____exports.isFrostmourneShardCardId(self, cardId)
     local id = math.floor(__TS__Number(cardId))