feat: Cookie-basierte Lokalisierung implementiert, ToLocal Erweiterungsmethoden hinzugefügt und Translation-Service entfernt. Stattdessen wird IStringLocalizer<T> verwendet, abhängig von der Situation wie Cookie-basierter Kultur oder Kultur basierend auf der Route.

DigitalData.Core.API/LocalizationExtensions.cs

@@ -0,0 +1,59 @@
+using Microsoft.AspNetCore.Localization;
+using Microsoft.Extensions.Localization;
+using System.Globalization;
+
+namespace DigitalData.Core.API
+{
+    /// <summary>
+    /// Provides extension methods for configuring localization services in an ASP.NET Core application.
+    /// These methods simplify the integration of cookie-based localization by setting up resource paths
+    /// and defining supported cultures.
+    /// </summary>
+    public static class LocalizationExtensions
+    {
+        /// <summary>
+        /// Adds localized resources and view localization services to the application.
+        /// </summary>
+        /// <param name="services">The IServiceCollection to add services to.</param>
+        /// <param name="resourcesPath">The path to the resource files used for localization.</param>
+        /// <returns>The IServiceCollection for chaining.</returns>
+        public static IServiceCollection AddCookieBasedLocalizer(this IServiceCollection services, string resourcesPath)
+        {
+            // Adds localization services with the specified resources path.
+            services.AddLocalization(options => options.ResourcesPath = resourcesPath);
+
+            // Adds MVC services with view localization and data annotations localization.
+            services.AddMvc().AddViewLocalization(Microsoft.AspNetCore.Mvc.Razor.LanguageViewLocationExpanderFormat.Suffix)
+                             .AddDataAnnotationsLocalization();
+
+            return services;
+        }
+
+        /// <summary>
+        /// Configures the application to use cookie-based localization with support for multiple cultures.
+        /// </summary>
+        /// <param name="app">The IApplicationBuilder to configure.</param>
+        /// <param name="supportedCultureNames">A params array of supported culture names.</param>
+        /// <returns>The IApplicationBuilder for chaining.</returns>
+        public static IApplicationBuilder UseCookieBasedLocalizer(this IApplicationBuilder app, params string[] supportedCultureNames)
+        {
+            // Converts supported culture names into CultureInfo objects and checks for null or empty array.
+            IList<CultureInfo> supportedCultures = supportedCultureNames.Select(cn => new CultureInfo(cn)).ToList();
+            var defaultCultureInfo = supportedCultures.FirstOrDefault() ??
+                throw new ArgumentNullException(nameof(supportedCultureNames), "Supported cultures cannot be empty.");
+
+            // Configures localization options including default and supported cultures.
+            var options = new RequestLocalizationOptions
+            {
+                DefaultRequestCulture = new RequestCulture(culture: defaultCultureInfo.Name, uiCulture: defaultCultureInfo.Name),
+                SupportedCultures = supportedCultures,
+                SupportedUICultures = supportedCultures
+            };
+            options.RequestCultureProviders.Add(new QueryStringRequestCultureProvider());
+
+            // Applies the localization settings to the application.
+            app.UseRequestLocalization(options);
+            return app;
+        }
+    }
+}