Refactor and translate comments and docstrings in utility modules to English for better clarity and maintainability. Update Gunicorn and application startup messages for consistency in language. Enhance documentation with English translations for better accessibility.

backend_api_python/app/services/live_trading/symbols.py

@@ -15,18 +15,18 @@ from typing import Dict, Tuple
 
 def _split_base_quote(symbol: str) -> Tuple[str, str]:
     """
-    分割符号为基础货币和报价货币。
+    The split symbols are base currency and quote currency.
     
-    处理各种格式：
+    Handle various formats:
     - BTC/USDT -> (BTC, USDT)
-    - BTCUSDT -> (BTCUSDT, "") - 需要进一步处理
-    - PI, TRX -> (PI, "") - 需要进一步处理
+    - BTCUSDT -> (BTCUSDT, "") - requires further processing
+    - PI, TRX -> (PI, "") - requires further processing
     """
     s = (symbol or "").strip()
     if ":" in s:
         s = s.split(":", 1)[0]
     if "/" not in s:
-        # 尝试识别报价货币（常见格式：BASEQUOTE）
+        # Try to identify the quote currency (common format: BASEQUOTE)
         s_upper = s.upper()
         common_quotes = ['USDT', 'USD', 'BTC', 'ETH', 'BUSD', 'USDC', 'BNB']
         for quote in common_quotes:
@@ -34,7 +34,7 @@ def _split_base_quote(symbol: str) -> Tuple[str, str]:
                 base = s_upper[:-len(quote)]
                 if base:
                     return base, quote
-        # 无法识别，返回原符号和空报价
+        # Unrecognized, the original symbol and empty quote are returned.
         return s_upper, ""
     base, quote = s.split("/", 1)
     return base.strip().upper(), quote.strip().upper()