public async Task<ActionResult> AddTranslation(ImageTranslation translation)
        {
            if (ModelState.IsValid)
            {
                db.AddTranslation(translation);
                await db.SaveChangesAsync();

                return RedirectToAction("Index");
            }

            return View(translation);
        }
        public async Task<ActionResult> AddTranslation(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            var image = await db.GetByIdAsync(id);

            if (image == null)
            {
                return HttpNotFound();
            }

            var model = new ImageTranslation
            {
                ImageId = image.Id
            };

            ViewBag.Languages = LanguageDefinitions.GenerateAvailableLanguageDDL(image.Translations.Select(t => t.LanguageCode));

            return View(model);
        }