1 - This is just abuse from those who reported your review -> i would contact the support just for this ....or i can help if you want....
2 - Why buying a version on Steam ? At least the devs if they have respected your choice to buy a copy on GOG should have offered you a copy on Steam (even if you don't have an account) : this would have be the minimum to respect you.... and later updating the GOG version : it's just a nonsense to do not doing so....
3 - As others social networks : this is rarely a good solution to expose this kind of case on them ; because the majority is using Steam and will go against you.

I agree with ERBlank it's just a second class customers treatment.

The House in Fate Morgana

It's missing a patch that added Korean Language

Also we are missing the art book.

Maybe contacting the publisher could get this released here.

Do you want to give it a try, before I put the game on the list?

I contacted Mangagamer ( I don't know if they are the ones to contact). I am sure they probably won't reply but even if they will they will find an excuse to not update the game to include the missing language and release the artbook. They actually never released the rest of Higurashi games. Thing is with publishers that rarely release their games here we need to contact them right away when something is missing and not after 5 years because they got the money and don't care

^ Btw, in the end I decided to create an entry right away. Because I looked into the matter and realised, as you said, that those things had been missing for years.

Thanks to our efforts to check for unlisted languages on the store, we corrected a total of 34 language options across 23 games. This also allowed us to take 13 entries off the list, though in most cases they weren't created to begin with, and a few games are still on the list because they have other issues unrelated to language.

There are these three special cases:

CAYNE: the Steam store page lists languages that must be downloaded separately from external links, so the actual game files are identical between GOG and Steam.

DUSK: the game has one single choice for Spanish and another single choice for Portuguese on both stores, yet the Steam page indicates that the game is also available in Latin American Spanish and Brazilian Portuguese.

Maid of Sker: Welsh language couldn't be indicated on the GOG store page, but at least we know Welsh language isn't really missing from the game.

Thanks also to Falran for taking care of all my reports.

↓ Done

The Binding of Isaac is once again missing the latest update, since it came out of beta just a month ago I was willing to give it some time, but... it doesn't look like it will be coming in a timely manner

And this update it's quite important since it implements item descriptions

Capitalism 2 is missing the 1.20 patch present on Steam.

GOG is still on version 1.14

I have emailed support to see if they have any response.

Sunny cafe
https://www.gog.com/en/game/sunny_cafe

We are missing the soundtrack and artbook

BUT the artbook is only in Chinese so I don't know if we should include it. The soundtrack though should have been here.
Can anyone help me find the contact info of the publisher so I can send them an email about it?

This seems to be their official website:
https://gamenobility.club/

They also have various social media accounts, and this is their email address:
info@gamenobility.club

I tried to use the contact form but everything is in Chinese. So I don't think it's possible to contact them. But on the store page Medibang is also listed as the publisher I believe but when I go to the contact form in their website you can only send them emails if you have business with them such as localization or distribution. Well I guess in a worst case scenario and someone wants the soundtrack he can get it on the other store since the game is not required to be purchased there.

I found this:

https://gamenobility.club/en/customer-service-form/

The button at the end: 送出 = Send

Thank you for finding this. Asked them if it's possible to release soundtrack and artbook here. The Thing is their contact form doesn't ask for my email address so I won't know if they will consider bringing them here. In any case I hope they do release them here.

There were no issues putting a Chinese-only DLC on Steam, so there's no reason why the same can't be done on GOG. It's not like there are no Chinese users on GOG, or users who are just interested in Chinese material.

It just occurred to me that actually Chinese is one of the few languages GOG.com (the website as a whole) is available in. Check the bottom.