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/store_manager.lua

@@ -1605,7 +1605,7 @@ function StoreManager.prototype.handlePurchase(self, playerId, itemId, itemData,
                         end
                         local cardId = math.floor(parsedCardId)
                         if CARD_PURCHASABLE_BY_ID[cardId] == false then
-                            self:sendPurchaseResult(playerId, false, "Эту карту нельзя купить")
+                            self:sendPurchaseResult(playerId, false, "This card cannot be purchased")
                             return true
                         end
                         local maxCopies = self:getCardMaxCopies(cardId)