I'm pretty sure, you'll find companies like this one which provide a nice GUI for helping with l10n or this one which offers translation services or this page that offers to convert between different formats, one of which probably has a nice GUI tool. Found them by 20 secs of googling. Source: about 1 year ago

Localise has no problem reading the json files or export to json, we recently started using it in collaboration with external translators. Source: about 1 year ago

Actually I don't have "my" app. But in our app we use https://lokalise.com/ to localize it even to Norwegian. Our team is not the most expensive company in the world btw. And we don't have 1B+ users all over the world. Source: about 1 year ago

Internationalization (i18n) pain for a documentation project is a process problem, not a feature gap. Documentation frameworks are not meant to translate your developer docs for you into the language of your choice. Some frameworks might offer i18n support, like the Crowdin support in Docusauraus v2. With Jekyll, you have to pick a theme like this one. I doubt if the reST or adoc frameworks would differ much from... - Source: dev.to / over 1 year ago

I've been thinking about building a micro saas very similar to this after having so many issues coordinating the localization of several products I manage. The only robust options in the market are incredibly expensive (for example https://lokalise.com/). Source: almost 2 years ago

Some Captionfy users have been creating subtitles for YouTube videos as a way to practice Japanese and other languages, it might be interesting to give a try as well - captionfy.io. Source: almost 2 years ago

Otherwise you can create the subtitles with captionfy.io and people can watch the video with your captions within the platform. It uses the original YouTube video, so the views still go to the YouTuber. Source: about 2 years ago

This website captionfy.io has a free editor that allows you to create captions and subtitles for YouTube and add colours, italics and etc. Here is a tutorial on how to do it, but site itself is simple enough. Source: about 2 years ago

A recent update from YouTube allows YouTubers now to invite others to be "Subtitle Editors" for their channel. It is the closest they got to the old Community Captions (where anyone could caption the video, not only the "allowed" users). There are also free alternatives to Community Captions like Captionfy and Amara, but probably many YouTubers don't know about them. Source: about 2 years ago

If you want to contribute, but don't know where to get started, I recommend using Captionfy.io or amara.org. Source: about 2 years ago