Add reference to documentation translation

Author: kisaragi-hiu

about/introduction.rst

@@ -54,7 +54,9 @@ open source `Sphinx <http://www.sphinx-doc.org>`_ and `ReadTheDocs
 
 .. note:: You can contribute to Godot's documentation by opening issue tickets
           or sending patches via pull requests on its GitHub
-          `source repository <https://github.com/godotengine/godot-docs>`_.
+          `source repository <https://github.com/godotengine/godot-docs>`_, or
+          translating it into your language on `Hosted Weblate
+          <https://hosted.weblate.org/projects/godot-engine/godot-docs/>`_.
 
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 (`CC-BY 3.0 <https://creativecommons.org/licenses/by/3.0/>`_) license, with