I can not translate this part (screenshot)

[MaurizioChi]

I can not translate this part (screenshot) 

[Gabriel Guarino]

Hi @MaurizioChi,

Have you followed the correct steps to implement the translations?

You can find an overview of the process in the Magento 2 DevDocs:

http://devdocs.magento.com/guides/v2.0/frontend-dev-guide/translations/xlate.html

Best regards.

Gabriel

[MaurizioChi]

I translated several parts and has always worked,

however it would seem a known problem, see link 

https://github.com/magento/magento2/issues/5509

Regards

[Fooman]

It looks like you ran into a bug with Magento. Certain Javascript provided strings can't yet be translated - see for example this comment here.

[MaurizioChi · Accepted solution]

Thanks so much
although it is not very elegant,
the solution is to directly edit the file that is located in

lib/web/mage/validation.js 

with the phrases already translated. 

I hope it is useful to other people. 

Ciao