use APPVERSION define

...and display version in about dialog

app/dialog/about/about.cpp

@@ -41,10 +41,11 @@ AboutDialog::AboutDialog(QWidget *parent) :
                          "<span style=\" text-decoration: underline; color:#007af4;\">"
                          "https://www.olivevideoeditor.org/"
                          "</span></a></p>"
-                         "<p><b>%1</b></p>" // AppName (version identifier)
-                         "<p>%2</p>" // First statement
-                         "<p>%3</p>" // Second statement
+                         "<p><b>%1</b> %2</p>" // AppName (version identifier)
+                         "<p>%3</p>" // First statement
+                         "<p>%4</p>" // Second statement
                          "</body></html>").arg(QApplication::applicationName(),
+                                               QApplication::applicationVersion(),
                                                tr("Olive is a non-linear video editor. This software is free and "
                                                   "protected by the GNU GPL."),
                                                tr("Olive Team is obliged to inform users that Olive source code is "