<text x="50" y="50">Some text</text>

"<text>" and "</text>" tags cannot contain attributes

<text>
  <!-- Here are your actual Text tags -->
  <text x="50" y="50">Some text</text>  
</text>

public void ConfigureServices(IServiceCollection services)
{
  services.AddLocalization(options =>
  {
   options.ResourcesPath = "Resources";
  });
 
  services.AddMvc()
    .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
    .AddDataAnnotationsLocalization(options=>
    {
      options.DataAnnotationLocalizerProvider = (type, factory) =>
      {
       return factory.Create(
        baseName: type.FullName /* بر این اساس نام فایل منبع متناظر باید به همراه ذکر فضای نام پایه آن هم باشد */,
        location: "Core1RtmTestResources.ExternalResources" /*نام اسمبلی ثالث*/);
      };
    });

public TestLocalController(
            IStringLocalizer<TestLocalController> stringLocalizer,
            IHtmlLocalizer<TestLocalController> htmlLocalizer)

private readonly IStringLocalizer _stringLocalizer;
private readonly IHtmlLocalizer _htmlLocalizer;
 
public TestLocalController(
    IStringLocalizerFactory stringLocalizerFactory,
    IHtmlLocalizerFactory htmlLocalizerFactory)
{
    _stringLocalizer = stringLocalizerFactory.Create(
        baseName: "Controllers.TestLocalController" /*مشخصات کنترلر جاری*/,
        location: "Core1RtmTestResources.ExternalResources" /*نام اسمبلی ثالث*/);
    _htmlLocalizer = htmlLocalizerFactory.Create(
        baseName: "Controllers.TestLocalController" /*مشخصات کنترلر جاری*/,
        location: "Core1RtmTestResources.ExternalResources" /*نام اسمبلی ثالث*/);
}

 public IEnumerable<SelectListItem> Names { get; set; }

model: new ProductCategoryViewModel { Names = ... }