def get_language_progress(self, lang):
        """Get informations about user's progression in a language."""
        if not self._is_current_language(lang):
            self._switch_language(lang)

        fields = ['streak', 'language_string', 'level_progress',
                  'num_skills_learned', 'level_percent', 'level_points',
                  'points_rank', 'next_level', 'level_left', 'language',
                  'points', 'fluency_score', 'level']

        return self._make_dict(fields, self.user_data.language_data[lang])
Get informations about user's progression in a language.