docs: use default language 'en' (#2538)

Since sphinx-5.0.0 "None" is not recommended anymore.
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J. Burfeind 2022-06-01 01:06:27 +02:00 committed by GitHub
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@ -58,7 +58,7 @@ master_doc = 'index'
# #
# This is also used if you do content translation via gettext catalogs. # This is also used if you do content translation via gettext catalogs.
# Usually you set "language" from the command line for these cases. # Usually you set "language" from the command line for these cases.
language = None language = 'en'
# List of patterns, relative to source directory, that match files and # List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files. # directories to ignore when looking for source files.