Update language field inside sphinx config file to comply with v5.0.0 #362
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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: sphinx-doc/sphinx#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.