Starting from v5.0.0, Sphinx does not allow language = None to be
defined in the configuration. The new behavior will cause the
documentation to error out once Sphinx5 is used during build.
See: https://github.com/sphinx-doc/sphinx/issues/10474
Side note: It's also possible to remove the field entirely, in that case the default value is used, which is 'en'. I am fine with either way.
Starting from v5.0.0, Sphinx does not allow language = None to be defined in the configuration. The new behavior will cause the documentation to error out once Sphinx5 is used during build. See: https://github.com/sphinx-doc/sphinx/issues/10474
Side note: It's also possible to remove the field entirely, in that case the default value is used, which is 'en'. I am fine with either way.