Greasy Fork is available in English.
Autoplays the second audio when the first is done.
There's sometimes a minor discrepancy between displayed and internal app state with this HIT.
I threw this script together in under 2 minutes (from first Inspect to final save), and reacting to the displayed state was the quickest solution that worked well on my machine.
YMMV - I suspect that this discrepancy makes a bigger impact on slower computers.