Remove duplicate function
Center random image
Rename methods
Add option to disable warning before randomizing a playlist
Improve options sheet
Reposition random image option buttons
Implement previous button and merge play and pause buttons
Implement option for warning before overwriting the queue
Fix: don't ask for continuing quiz if last position was the beginning
Refine quiz control window design
Fix showing the wrong remaining time
Fix font size, needs a dot as decimal seperator
Fix resetting the play button if a song ends
Fix counting the playlist position over the songlist count
Add track progression indicator label
Validate min and max image wait titles
Implement showing image when previous button is pressed
Update german translation
Add function for displaying a youtube video in a window
Rename variable for clearer description