How can I uninstall this app?
Go to Settings > Security > Device Administrators and disable AcDisplay.
You can now uninstall AcDisplay normally.
How can I dismiss the permanent notifications from active mode and the lockscreen?
The notification is necessary to ensure AcDisplay isn't killed by the system.
However, to hide it safely (test notifications won't function anymore!) go to Settings > Apps > AcDisplay and disable showing notifications. NOTE: Sending test notifications will not function while this is disabled.
When will secure lockscreen (pattern/PIN) be implemented?
It is not possible to create a custom, secure lockscreen for Android.
Other apps that have this feature only pretend to be secure, but in the real world there's always a way to bypass them.
When will the double-tap to wake be implemented?
It is not possible to implement, cause it requires a kernel modification.
I can see a typo / mistake in the translation!
Thanks, you can easily help out with that.
Join the app's page on crowdin and suggest a better translation.