Locale (Windows): print standard format

src/detection/locale/locale_windows.c

@@ -0,0 +1,18 @@
+#include "detection/locale/locale.h"
+#include "util/windows/unicode.h"
+
+#include <windows.h>
+#include <locale.h>
+
+void ffDetectLocale(FFstrbuf* result)
+{
+    wchar_t name[LOCALE_NAME_MAX_LENGTH];
+    int size = GetUserDefaultLocaleName(name, LOCALE_NAME_MAX_LENGTH);
+    if (size > 1) // including '\0'
+    {
+        ffStrbufSetNWS(result, (uint32_t)size - 1, name);
+        ffStrbufAppendS(result, ".UTF-8"); // set explictly in `ffInitInstance`
+    }
+    else
+        ffStrbufSetS(result, setlocale(LC_ALL, NULL));
+}