'en-gb' => 'British English', # British English
'eo' => 'Esperanto', # Esperanto
'es' => 'español', # Spanish
+ 'es-formal' => 'español (formal)', # Spanish formal address
'et' => 'eesti', # Estonian
'eu' => 'euskara', # Basque
'ext' => 'estremeñu', # Extremaduran