Fix grid and guide startup behavior and update german translation

sources/qetproject.h

@@ -28,7 +28,7 @@
 #include "properties/xrefproperties.h"
 #include "titleblock/templatescollection.h"
 #include "titleblockproperties.h"
-
+#include "diagram.h"
 #ifdef BUILD_WITHOUT_KF5
 #else
 #	include <KAutoSaveFile>
@@ -52,6 +52,23 @@ class TerminalStrip;
 class KAutoSaveFile;
 #endif
 
+#include <QColor>
+
+struct GuideProperties {
+	int orientation; // 0 = Horizontal, 1 = Vertical
+	qreal position;
+	QColor color;
+
+	bool operator==(const GuideProperties &other) const {
+		return orientation == other.orientation &&
+		position == other.position &&
+		color == other.color;
+	}
+	bool operator!=(const GuideProperties &other) const {
+		return !(*this == other);
+	}
+};
+
 /**
 	This class represents a QET project. Typically saved as a .qet file, it
 	consists in an XML document grouping 0 to n diagrams and embedding an elements
@@ -115,6 +132,9 @@ class QETProject : public QObject
 		BorderProperties defaultBorderProperties() const;
 		void             setDefaultBorderProperties(const BorderProperties &);
 
+		QList<GuideProperties> defaultGuides() const;
+		void setDefaultGuides(const QList<GuideProperties> &guides);
+
 		TitleBlockProperties defaultTitleBlockProperties() const;
 		void                 setDefaultTitleBlockProperties(const TitleBlockProperties &);
 
@@ -267,6 +287,8 @@ class QETProject : public QObject
 		QString read_only_file_path_;
 			/// Default dimensions and properties for new diagrams created within the project
 		BorderProperties default_border_properties_ = BorderProperties::defaultProperties();
+			/// Default guides for new diagrams created within the project
+		QList<GuideProperties> m_default_guides;
 			/// Default conductor properties for new diagrams created within the project
 		ConductorProperties default_conductor_properties_ = ConductorProperties::defaultProperties();
 			/// Default title block properties for new diagrams created within the project