Problem with the New Translation System of 1.7

[ilyass86]

Hi,

I'm using prestashop  1.7.5.2  and i try to translate my module using the new translation system 

'title' => $this->trans('Products Info', array(), 'Modules.Storepayment.Admin')

( storepayment is the name of my module )

when i go to backOffice > translation> translation of installed modules; I don't find the key 'Products Info' 

but when i use the classical approch of version 1.6

'title' => $this->l('Products Info'), (deprecated)

the key 'Products info' appears and all work fine

any suggestion?