Does the “Translation Locale” add-on support custom languages beyond those listed?

I’m aiming to translate my entire project into a language not included in the “Translation Locale” add-on’s list. Before purchasing, I want to ask community if the add-on supports adding custom languages that I can configure myself, for instance, through a .json file for example.

I don’t need to translate user-generated content (like posts); my goal is to translate the entire project interface (buttons, menus, etc.) into a custom language.

Has anyone tackled this task before? Any advice or insights would be appreciated!

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