The description of the player keyboard shortcuts (see screenshot) seems to be very technical inclined.
The following improvements would make it more "human"-conform:
a) Related shortcuts should be near each other, so instead of
The order should be something like
b) Do use human-readable names for shortcuts, not variable names
Example: Instead of volUp use Volume Up, instead of nextChapter, use Next Chapter, etc.
There should also be internationalization for this