Fixed #33753 -- Fixed docs build on Sphinx 5+.
Empty language is not supported anymore.
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@ -9,6 +9,11 @@ PAPER ?=
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BUILDDIR ?= _build
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LANGUAGE ?=
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# Set the default language.
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ifndef LANGUAGE
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override LANGUAGE = en
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endif
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# Convert something like "en_US" to "en", because Sphinx does not recognize
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# underscores. Country codes should be passed using a dash, e.g. "pt-BR".
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LANGUAGEOPT = $(firstword $(subst _, ,$(LANGUAGE)))
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