en-GB en-US fr-FR Generate

For testers: because this example uses a worker placed in the folder dist of this project, a server must be used to test it, for example:

cd pico2wave.js && python3 -m http.server

For developers: note that if you want the sound file generated on mobile to be played using a hidden html audio element, it must be played a first time with a blank sound file from an event handler during an action performed by the user.