String-Lokalisierer für Model.resx im Common-Projekt hinzugefügt.

EnvelopeGenerator.GeneratorAPI/Program.cs

@@ -4,7 +4,9 @@ using DigitalData.UserManager.Application;
 using DigitalData.UserManager.Infrastructure.Repositories;
 using EnvelopeGenerator.Application;
 using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Localization;
 using Microsoft.EntityFrameworkCore;
+using System.Globalization;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -73,7 +75,17 @@ if (app.Environment.IsDevelopment())
 app.UseCors("AllowSpecificOriginsPolicy");
 
 // Localizer
-app.UseCookieBasedLocalizer("de-DE", "en-US");
+string[] supportedCultureNames = { "de-DE", "en-US" };
+IList<CultureInfo> list = supportedCultureNames.Select((string cn) => new CultureInfo(cn)).ToList();
+CultureInfo cultureInfo = list.FirstOrDefault() ?? throw new ArgumentNullException("supportedCultureNames", "Supported cultures cannot be empty.");
+RequestLocalizationOptions requestLocalizationOptions = new RequestLocalizationOptions
+{
+    SupportedCultures = list,
+    SupportedUICultures = list
+};
+requestLocalizationOptions.RequestCultureProviders.Add(new QueryStringRequestCultureProvider());
+app.UseRequestLocalization(requestLocalizationOptions);
+
 
 app.UseHttpsRedirection();