Add Vietnamese translation details (#1789)

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: tamnd

documentation/translations/translating.rst

@@ -118,6 +118,10 @@ For more details about translations and their progress, see
      - Dmytro Kazanzhy (:github-user:`kazanzhy`, `email <mailto:dkazanzhy@gmail.com>`__)
      - :github:`GitHub <python/python-docs-uk>`,
        `Transifex <tx_>`_
+   * - Vietnamese (vi)
+     - Duc-Tam Nguyen (:github-user:`tamnd`)
+     - :github:`GitHub <tamnd/python-docs-vi>`,
+       `Transifex <tx_>`_
 
 
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