Implementing better localhost support and Id verification

BuechermarktClient/bin/Debug/BuechermarktClient.exe.config

@@ -9,6 +9,10 @@
         <assemblyIdentity name="System.Runtime.InteropServices.RuntimeInformation" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-4.0.1.0" newVersion="4.0.1.0" />
       </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="DocumentFormat.OpenXml" publicKeyToken="8fb06cb64d019a17" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-2.8.1.0" newVersion="2.8.1.0" />
+      </dependentAssembly>
     </assemblyBinding>
   </runtime>
 </configuration>