Kuro no Kiseki was already released about a year ago. Even Kuro no Kiseki 2 was already released in January. But both are currently only available in Japanese with Chinese and Korean subtitles.
And considering that NISA, the company who does the English translations for Falcom games, is currently working on Trails into Reverie and Legend of Nayuta and there has not even been an announcement for Kuro no Kiseki yet I wouldn't count on the games being available in English before 2024.
Trails to Azure should be out tomorrow though if there aren't any last minute delays.
Kuro no Kiseki got a unofficial fan translation for the version provided on Steam. However, someone is giving their best trying to "kill" those patches. Not truly gentle because have to remember: Without a fan translation some other games of the series would have been impossible ("Trails from Zero" on GoG is made with fan translation), because the official translators are so terribly slow or simply got no interest at all for english translations. More infos here: https://venturebeat.com/games/nis-america-is-making-fan-translations-official-with-trails-from-zero-and-trails-to-azure
"Kuro no Kiseki" is currently officially translated into 3 languages, mainly for the markets with the "highest renevue expected" (Japan, China and Korea), somewhat lame but thats how it works. Maybe there is a official EN translation out someday but no one knows the day it may actually arrive... it can take years because currently NIS is still busy translating 2 older games into english and the english translation team is generally just a few people or even just one single person (you can read the difficult translation story on the first few "Trails in the Sky"-titles). Way lesser "force" than the fans may able to provide. This is a situation i am not sure anymore if todays world of "how we make stuff work" is truly useful as a whole because ultimately stuff could be done better but it may not be done in a better way. Generally i do support modding because it is for the gamers and the gamers are the ones actually in the true charge
; sometimes the creators may forget this basic economic rule because to many "stupid gamers" sadly...
I still think the world will slowly become better for everyone, aswell thanks to GoG.
In short: "Trails from Zero" (already released) and "Trails to Azure" (coming soon) should be a official fan translation. "Trails into Reverie" and" Legend of Nayuta" on the other hand is from the official team. In total 3 games they are currently working on it, "Kuro no Kiseki" being the newest title and currently without ressources left. The next release is probably "Trails to Azure"; already stated. According to GoG it will be tomorrow.
I think, as soon as there is a english version we may get "Kuro no Kiseki" on GoG too, but until this moment all we can do is waiting... at worst it could take years.
As for Steam: Nowadays they are so powerful on the market, the Chinese are creating even more Steam-traffic than the US is doing... so it is unavoidable not to provide the chinese-Version on Steam.