Utils: Add PhoneNrTypes

Elwig/Windows/MemberAdminWindow.xaml.cs

@@ -19,11 +19,7 @@ namespace Elwig.Windows {
         private readonly RoutedCommand CtrlF = new();
         private readonly (ComboBox, TextBox, TextBox)[] PhoneNrInputs;
 
-        private static ObservableCollection<KeyValuePair<string, string>> PhoneNrTypes { get; set; } = [
-            new("landline", "Tel.-Nr. (Festnetz)"),
-            new("mobile", "Tel.-Nr. (mobil)"),
-            new("fax", "Fax-Nr."),
-        ];
+        private static ObservableCollection<KeyValuePair<string, string>> PhoneNrTypes { get; set; } = new(Utils.PhoneNrTypes);
 
         public MemberAdminWindow() {
             InitializeComponent();