Directive to add link to other language page on page document

[attakei]

Overview

Render links to other language translations on body of document.

Spec

Write directive on document.

..
    This is `about.rst` on root of document.

.. mini18n::

# conf.py

# atsphinx.mini18n
mini18n_default_language = "en"
mini18n_support_languages = ["en", "ja"]

<!-- Output for language=en
<ul>
  <li>English</li>
  <li><a href="/ja/about.html">Japanese</a></li>
</ul>

<!-- Output for language=ja
<ul>
  <li><a href="/en/about.html">英語</a></li>
  <li>日本語</li>
</ul>