From translatewiki.net

    This is the template for the qqq.json descriptions of the auto-generated project names, that are to be translated locally.

    The parameters are:

    • url e.g. https://de.wikipedia.org
    • name in English, e.g. "German Wikipedia"
    • language language code, often the same as in the domain, but not necessarily. If the language name is not important to the project name, use zxx or omit the parameter altogther.