fix: 修复多语言修改bug

aspnet-core/modules/LanguageManagement/src/Lion.AbpPro.LanguageManagement.Domain/LanguageTexts/LanguageTextManager.cs

@@ -68,9 +68,12 @@ public class LanguageTextManager : LanguageManagementDomainService, ILanguageTex
             entity = new LanguageText(GuidGenerator.Create(), cultureName, resourceName, name, value, CurrentTenant.Id);
             await _languageTextRepository.InsertAsync(entity);
         }
+        else
+        {
+            entity.Update(cultureName, resourceName, name, value);
+            entity = await _languageTextRepository.UpdateAsync(entity);
+        }
         
-        entity.Update(cultureName, resourceName, name, value);
-        entity = await _languageTextRepository.UpdateAsync(entity);
         return _objectMapper.Map<LanguageText, LanguageTextDto>(entity);
     }