Fix get runtime language code

解决在 Windows 平台获取的语言编码不符合 RFC1766 的问题；

Author: muziing

src/py2exe_gui/Core/runtime_info.py

@@ -5,7 +5,7 @@
 运行时信息
 """
 
-from locale import LC_CTYPE, getlocale
+from locale import getdefaultlocale
 from typing import NamedTuple, Optional
 
 from ..Constants import PLATFORM, get_platform
@@ -16,4 +16,7 @@ class RuntimeInfo(NamedTuple):
     language_code: Optional[str]
 
 
-RUNTIME_INFO = RuntimeInfo(get_platform(), getlocale(category=LC_CTYPE)[0])
+# 虽然 locale.getdefaultlocale() 函数已被废弃[https://github.com/python/cpython/issues/90817]，
+# 但仍然是目前唯一能在 Windows 平台正确获取语言编码的方式[https://github.com/python/cpython/issues/82986]
+# 当 Python 更新修复了这一问题后，将迁移至 locale.getlocale()
+RUNTIME_INFO = RuntimeInfo(get_platform(), getdefaultlocale()[0])  # noqa