Fixed localization issues, fixed text-warning not accessible,

Program.cs

@@ -80,7 +80,15 @@ if (!app.Environment.IsDevelopment())
 }
 
 app.UseHttpsRedirection();
-app.UseRequestLocalization();
+
+// Add localization
+var supportedCultures = new[] { "de", "de-DE", "en-US" };
+var localizationOptions = new RequestLocalizationOptions()
+    .SetDefaultCulture("de")
+    .AddSupportedCultures(supportedCultures)
+    .AddSupportedUICultures(supportedCultures);
+
+app.UseRequestLocalization(localizationOptions);
 app.UseRouting();
 
 app.UseAuthentication();