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< get_language (self.language, None)

---

> get_language (self.language)

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< get_language (language, None)

---

> get_language (language)

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< self.docutils_languages[lang] = get_language(lang, None)

---

> self.docutils_languages[lang] = get_language(lang)

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< get_language(lang.split('_', 1)[0], None)

---

> get_language(lang.split('_', 1)[0])