public async Task <IHttpActionResult> Post(WordTranslationImportModel wordtranslation)
        {
            if (wordtranslation == null)
            {
                throw new ArgumentNullException("word translation model can't be empty");
            }
            if (wordTranslationService.Exists(wordtranslation.OriginalWordId, wordtranslation.TranslationWordId) == 0)
            {
                int res = await wordTranslationService.AddAsync(wordtranslation);

                return(Ok(res.ToString()));
            }
            else
            {
                return(BadRequest("Such wordtranslation exists"));
            }
        }