Translate UI strings to German and update navigation

Updated the `Resources.resw` file with German translations for various UI strings, including "Workbench" to "Werkbank" and "Browse back" to "Zurück navigieren". Adjusted some values for consistency, such as "About electrifier" to "über electrifier", and removed an extra space in the XML schema.

In `ShellPage.xaml`, modified `AutomationProperties.Name` attributes for `NavigationViewItem` elements to include a "Nav2" prefix, reflecting changes in navigation structure or functionality.

`TreeViewItem` element updated with new attributes

Updated the `TreeViewItem` element in several ways. The `Content` attribute, previously bound to `DisplayName`, has been removed, meaning the element no longer displays the `DisplayName` as its content. An `IsExpanded` attribute has been added with a default value of `True`, causing the element to always be expanded. Additionally, an `ItemsSource` attribute has been added and bound to `Children`, allowing the element to display child items if any are present.

Navigation (#8)

bump to version "electrifier alpha 4 Windows, build v1.24.331". Alter
NavigationView