[chore:] filter by germany for running-sheet creation

DataStore/DataStructures.cs

@@ -180,6 +180,17 @@ public class KasPerson
 
     public string used_plz { get; set; } = "";
 
+    public bool IsGermany()
+    {
+        var trimmedLand = (land ?? "").Trim();
+        var trimmedLowerLand = trimmedLand.ToLower();
+        var isGermany = trimmedLowerLand == "germany" || trimmedLowerLand == "ger" ||
+                        trimmedLowerLand == "" || trimmedLowerLand == "de" ||
+                        trimmedLowerLand == "deutschland";
+
+        return isGermany;
+    }
+    
     public static void SetUsedPLZ(int id, string plz)
     {
         foreach (var set in Settings._instance.addressSets.addresses)

Tasks/PdfBuilder.cs

@@ -604,7 +604,7 @@ public class PdfBuilder
 
         List<IGrouping<string, KasPerson>> sorted_list = list.KasPersons
             .Where(x => !string.IsNullOrEmpty(x?.used_plz) &&
-                        x.used_plz.Length >= stpoint)
+                        x.used_plz.Length >= stpoint && x.IsGermany())
             .OrderBy(x => x.used_plz)
             .GroupBy(x => x.used_plz.Substring(0, stpoint))
             .ToList();