I should be clear - we didn't localize the app, just the description.
And China isn't large (less than $10/day), but it's growing, and it's definitely worth it considering it only cost $14 to get the translation written and edited. Same goes for South Korea.
South Korea is basically the same. We went from unranked to 13th free and 28th paid navigation app.
We're making ~$3-5/day in SK now, though I expect that will rise more as our Lite pipeline converts.
It's only a couple thousand a year right now, but i expect growth, and the price was definitely right! I've spent more time talking about translations on HN now than I spent getting them all done I think, and the cash was negligible.
And China isn't large (less than $10/day), but it's growing, and it's definitely worth it considering it only cost $14 to get the translation written and edited. Same goes for South Korea.