Fix grid and guide startup behavior and update german translation

sources/ui/configpage/guidespropertieswidget.h

@@ -0,0 +1,32 @@
+#ifndef GUIDESPROPERTIESWIDGET_H
+#define GUIDESPROPERTIESWIDGET_H
+
+#include <QWidget>
+#include <QList>
+#include "../../diagram.h"
+
+class QTableWidget;
+class QPushButton;
+
+class GuidesPropertiesWidget : public QWidget {
+    Q_OBJECT
+public:
+    explicit GuidesPropertiesWidget(QWidget *parent = nullptr);
+    ~GuidesPropertiesWidget() override;
+
+    QList<Diagram::Guide> guides() const;
+    void setGuides(const QList<Diagram::Guide> &guides);
+
+private slots:
+    void addGuide();
+    void removeGuide();
+
+private:
+    void setupUi();
+
+    QTableWidget *m_table;
+    QPushButton *m_add_btn;
+    QPushButton *m_remove_btn;
+};
+
+#endif // GUIDESPROPERTIESWIDGET_H