Fix bug forcing to click dozen of times on "Open" button

[d-vogel]

Hello all,
I'm trying to fix some issues in GRBL Controller which are ennoying me :
I'm working on the following bug : when I'm firering the app, I have to click many times to get the program connected to the arduino. the bug is due to the shortcut which isn't the same in the translation and the ui.
you can see this by adding the folowing code :

info("button says %s test wants %s", ui->btnOpenPort->text().toUtf8().constData(), open_button_text.toUtf8().constData());

at the beginning of MainWindow::openPortCtl
I'm getting the following result :
"button says O&uvrir test wants Ouvrir" (french localized)
a shortcut is apparently added to the button, but I can't find where this happends. I know QPushButton uses the first letter by default as shortcut, but here it seems different.