Update German language file

src/panels/Checklist.cc

@@ -115,7 +115,7 @@ void Checklist::setOptions(const QDomNode &options)
 	}
 
 	if (list_->count() == 0) {
-		topLog(QString(tr(R"(Invalid XML syntax for Checklist panel "%1::%2": no checkable options set.)").arg(
+		topLog(QString(tr(R"(XML error: Invalid XML syntax for Checklist panel "%1::%2": no checkable options set.)").arg(
 		    section_, key_)), "error");
 		list_->setVisible(false);
 		return;