I'm already sold on the idea of using Git as a database for content and localization. But I'm obviously biased as we are working on a similar solutation ;) It is called FrontAid and it is a CMS that stores your (localized) content in a JSON file within your own repo. More information can be found at https://frontaid.io/
Using Git for content has some great benefits. Like complete version history, easy reverts (for devs at least), (feature) branch support, Git hooks, ... And of course, you own your content at all times.
PS: Both the "Editor" and "VS-Code-Extension" links in your repo are broken.