private Dictionary<string, Dictionary<string, string>> LoadEmbeddedLocalizations()
{
    var result = new Dictionary<string, Dictionary<string, string>>(StringComparer.OrdinalIgnoreCase);

    foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
    {
        LoadAssemblyLocalizations(assembly, result);
    }

    return result;
}

private void LoadAssemblyLocalizations(Assembly assembly, Dictionary<string, Dictionary<string, string>> result)
{
    var resourceNames = assembly
        .GetManifestResourceNames()
        .Where(r => r.EndsWith(".json", StringComparison.OrdinalIgnoreCase));

    foreach (var resourceName in resourceNames)
    {
        var culture = GetCultureFromResourceName(resourceName);
        if (culture == null) continue;

        var parsed = ReadLocalizationResource(assembly, resourceName);
        if (parsed == null) continue;

        MergeLocalizationEntries(result, culture, parsed);
    }
}

private static string? GetCultureFromResourceName(string resourceName)
{
    var parts = Path.GetFileNameWithoutExtension(resourceName)?.Split('.');
    return parts?.LastOrDefault()?.ToLowerInvariant();
}

private static Dictionary<string, string>? ReadLocalizationResource(Assembly assembly, string resourceName)
{
    using var stream = assembly.GetManifestResourceStream(resourceName);
    if (stream == null) return null;

    using var reader = new StreamReader(stream);
    var json = reader.ReadToEnd();

    return JsonSerializer.Deserialize<Dictionary<string, string>>(json);
}

private static void MergeLocalizationEntries(
    Dictionary<string, Dictionary<string, string>> result,
    string culture,
    Dictionary<string, string> parsed)
{
    if (!result.TryGetValue(culture, out var dict))
    {
        dict = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
        result[culture] = dict;
    }

    foreach (var kv in parsed)
    {
        if (!dict.ContainsKey(kv.Key))
        {
            dict[kv.Key] = kv.Value;
        }
        // else: optionally log duplicate keys here
    }
}