Re-Add languages to elastic search index. Just before `return d` add

```
        # Add to search index language code, language name in English
        # native language name.
        languages = []
        for code in obj.languages.values_list('language_code', flat=True):
            languages.append(code)
            languages.append(langcode_to_name(code, 'en_US'))
            languages.append(langcode_to_name(code, code))
        d['languages'] = list(set(languages))
```