Setting ContentFragment language in an XhtmlString

I have page that hosts an XhtmlString property and the page has multiple translations. In the XhtmlString area there is also a block, which has multiple translations as well. I am trying to get the XhtmlString in a WebApi context and convert it to raw HTML. StaticFragment items in XhtmlString is being read correctly from the database according the language parameter I send to IContentLoader.Get<>. Example:

var page = _contentLoader.Get<OccupationInfoPage>(page.ContentLink, new CultureInfo("en");

 I am than using the following method to convert the XhtmlString to raw HTML:

        public static string ToRawHtml(this XhtmlString xhtmlstring)
        {
            if (string.IsNullOrWhiteSpace(xhtmlstring?.ToHtmlString()) || xhtmlstring.IsEmpty)
            {
                return string.Empty;
            }
            var routeData = new RouteData();
            routeData.Values.Add("controller", "a");
            routeData.Values.Add("subject", "a");
            var hh = new HtmlHelper(new ViewContext()
            {
                HttpContext = new HttpContextWrapper(HttpContext.Current),
                ViewData = new ViewDataDictionary(),
                TempData = new TempDataDictionary(),
                Controller = new DummyController(),
                RouteData = routeData
            }, new ViewPage());
            string result;
            using (var writer = new StringWriter())
            {
                hh.ViewContext.Writer = writer;
                hh.RenderXhtmlString(xhtmlstring);
                writer.Flush();
                result = writer.ToString();
            }
            return result;
        }

While this method returns the raw HTML I am looking for, with normalized links, it also defaults to master language for ContentFragment items. Is there any way to set the language in HtmlHelper object or somewhere else so I can get the correct version, both for the blocks and the links?