The channel test was reworked: three words per ear instead of one — a single word is too short to tell which direction it came from — it follows the language picker, and it shows which output device the app detected.

It also explains why the silenced channel is still faintly audible with a headset that has a microphone: the mic picks up the ear that is playing. The app sends nothing there.

Two things in the store description were out of date (interface, size of the corpus) and are correct again.
