Add Greek translation

Author: hugovk

CHANGELOG.rst

@@ -5,6 +5,7 @@ Changelog
 ---------------------------------------------------------------------------
 
 * Enable theme translation by @StanFromIreland in https://github.com/python/python-docs-theme/pull/246
+* Add Greek translation by @lysnikolaou https://github.com/python/python-docs-theme/pull/256
 * Add Swedish translation by @yeager in https://github.com/python/python-docs-theme/pull/250
 * Pull Brazilian Portuguese, Simplified Chinese, Traditional Chinese translations from `Transifex <https://explore.transifex.com/python-doc/python-docs-theme/>`_ in https://github.com/python/python-docs-theme/pull/253