def METHOD_NAME(self, corpora):
    """
    Find a first language+corpus with available translations
    for the primary language (= corpora[0]).
    """
    primary_lang = self._lang_from_corpname(corpora[0])
    translations = self.AVAIL_LANG_MAPPINGS.get(primary_lang, [])
    for cn in corpora[1:]:
        lang = self._lang_from_corpname(cn)
        if lang in translations:
            return cn, lang
    return None, None