Update Calendar Locale

src/main/java/app/views/matchday/components/MatchdayCard.java

@@ -24,13 +24,14 @@ import com.vaadin.flow.component.orderedlayout.VerticalLayout;
 
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
+import java.util.Locale;
 import java.util.NoSuchElementException;
 
 public class MatchdayCard extends Div implements ContentConfigurable {
 
     private final Navigation navigation;
 
-    private final Calendar calendar = Calendar.getInstance();
+    private final Calendar calendar = Calendar.getInstance(Locale.GERMAN);
     SimpleDateFormat dateFormat = new SimpleDateFormat("dd.MM.");
 
     private final HorizontalLayout header = new HorizontalLayout();