[es] Wrong orthography in Spanish: accents in "deciséis", "dólar", "dólares", "veintiún"

[gonsalet]

Expected Behaviour

>>> from num2words import num2words
>>> num2words('16', lang='es')
'dieciséis'
>>> num2words('1', lang='es', to='currency', currency='USD')
'un dólar con cero centavos'
>>> num2words('16', lang='es', to='currency', currency='EUR')
'dieciséis euros con cero céntimos'
>>> num2words('21', lang='es', to='currency', currency='EUR')
'veintiún euros con cero céntimos'

(Correct orthography according to official Diccionario de la lengua española ( https://dle.rae.es/ ).)

Actual Behaviour

>>> from num2words import num2words
>>> num2words('16', lang='es')
'dieciseis'
>>> num2words('1', lang='es', to='currency', currency='USD')
'un dolar con cero centavos'
>>> num2words('16', lang='es', to='currency', currency='EUR')
'dieciseis euros con cero céntimos'
>>> num2words('21', lang='es', to='currency', currency='EUR')
'veintiun euros con cero céntimos'

Steps to reproduce

>>> from num2words import num2words
>>> num2words('16', lang='es')
'dieciseis'
>>> num2words('1', lang='es', to='currency', currency='USD')
'un dolar con cero centavos'
>>> num2words('16', lang='es', to='currency', currency='EUR')
'dieciseis euros con cero céntimos'
>>> num2words('21', lang='es', to='currency', currency='EUR')
'veintiun euros con cero céntimos'

[gonsalet]

Fixed in pull request #443 (waiting for review).