Perhaps I can help with a plugin I developed a few weeks ago. It is designed for use within the Editor—specifically for setting and viewing localization keys—but using CSV files.
Here is the thread where I post updates and where users can leave comments:
There are two ways to use it: one is via the Inspector, and the other is by placing the “SetAndSeeButtonEditor” node. The latter is intended for use in other plugins that are integrated into the Editor. You can find full details in the repository.