feat(i18n): 添加多语言支持功能

- 新增国际化系统，支持中英文切换
- 添加语言选择对话框和语言切换按钮回调
- 扩展配置系统以支持语言设置存储
- 创建语言文件目录结构和占位文件
- 更新主窗口支持UI文本动态刷新

libs/gettext/include/textstyle/version.h

@@ -0,0 +1,45 @@
+/* Meta information about GNU libtextstyle.
+   Copyright (C) 2009-2026 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible.  */
+
+#ifndef _TEXTSTYLE_VERSION_H
+#define _TEXTSTYLE_VERSION_H
+
+/* Get LIBTEXTSTYLE_DLL_VARIABLE.  */
+#include <textstyle/woe32dll.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Version number: (major<<16) + (minor<<8) + subminor. */
+#define _LIBTEXTSTYLE_VERSION 0x010000
+extern LIBTEXTSTYLE_DLL_VARIABLE const int _libtextstyle_version; /* Likewise */
+
+
+/* 1 if libtextstyle was built with iconv support, 0 if not.  */
+#define LIBTEXTSTYLE_USES_ICONV 1
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _TEXTSTYLE_VERSION_H */