Right click on vertical header to delete the selected record(s)

The text is got from the "Delete record" button, so the text is updated to
"Delete records" when appropriate.

See feature request #1283

src/MainWindow.cpp

@@ -2452,6 +2452,13 @@ void MainWindow::showRecordPopupMenu(const QPoint& pos)
             duplicateRecord(row);
     });
 
+    QAction* deleteRecordAction = new QAction(ui->buttonDeleteRecord->text(), &popupRecordMenu);
+    popupRecordMenu.addAction(deleteRecordAction);
+
+    connect(deleteRecordAction, &QAction::triggered, [&]() {
+            deleteRecord();
+    });
+
     popupRecordMenu.exec(ui->dataTable->verticalHeader()->mapToGlobal(pos));
 }