Add Sphinx translation link to README files

Author: m-aciek

README.en.md

@@ -88,4 +88,5 @@ You signify your acceptance of this agreement by submitting your work for inclus
 * [Projects of the Python Packaging Authority](https://hosted.weblate.org/projects/pypa/-/pl/)
 * [Scientific Python Translations](https://scientific-python-translations.github.io/)
 * [micro:bit translation programme](https://microbit.org/translate/)
+* [Sphinx translation](https://www.sphinx-doc.org/en/master/usage/advanced/intl.html#contributing-to-sphinx-reference-translation)
 * [Localizing Django](https://docs.djangoproject.com/en/dev/internals/contributing/localizing/)

README.md

@@ -90,4 +90,5 @@ Wyrażasz akceptację tej umowy przesyłając swoją pracę do włączenia do do
 * [projekty Python Packaging Authority](https://hosted.weblate.org/projects/pypa/-/pl/)
 * [Scientific Python Translations](https://scientific-python-translations.github.io/)
 * [micro:bit translation programme](https://microbit.org/translate/)
+* [tłumaczenie Sphinksa](https://www.sphinx-doc.org/en/master/usage/advanced/intl.html#contributing-to-sphinx-reference-translation)
 * [Localizing Django](https://docs.djangoproject.com/en/dev/internals/contributing/localizing/)