just moving the code to the `wifi.js` file, to try to get all the wifi related code in one place. Something like...

```javascript
var WifiUI = {
[...]
  addHiddenNetwork: function wui_addHiddenNetwork() {
    // Remove refresh option
    UIManager.activationScreen.classList.add('no-options');
    // Update title
    UIManager.mainTitle.textContent = _('join-hidden-button');
    UIManager.navBar.classList.add('secondary-menu');
    window.location.hash = '#hidden-wifi-authentication';
}
[...]
};
```
And, yes, I understand that we will be calling wifi from ui to deal with ui, but anyway, is Wifi related, so lets try to compartmentalise