services.Configure<ApiBehaviorOptions>(options =>
{
options.SuppressModelStateInvalidFilter = true;
});
services.AddLocalization(options => options.ResourcesPath = "Resources");
// Configure supported cultures and localization options
services.Configure<RequestLocalizationOptions>(options =>
{
var supportedCultures = new[]
{
new CultureInfo("en"),
new CultureInfo("pl"),
new CultureInfo("de")
};
options.DefaultRequestCulture = new RequestCulture(culture: "en", uiCulture: "en");
// You must explicitly state which cultures your application supports.
// These are the cultures the app supports for formatting numbers, dates, etc.
options.SupportedCultures = supportedCultures;
// These are the cultures the app supports for UI strings, i.e. we have localized resources for.
options.SupportedUICultures = supportedCultures;
//options.RequestCultureProviders.Insert(0, new QueryStringRequestCultureProvider());
});
services.AddMvc().AddViewLocalization().AddDataAnnotationsLocalization(); 
