Ah, of course! Thank you Sofy!  👍 

Another one that I cannot translate, either with Poedit or with Phrases: 

I allow to create an account and send confirmation email.

Hi Alain,

As I've mentioned here,  if you can’t find some phrase, navigate to Dashboard > Forums > Phrases admin page, add the missing phrase using [Add new] button. 

Don't forget to delete phrase caches before checking. 

Yes, you told me so, but sometime, it just doesn't work. As here:  https://wpforo.com/community/how-to-and-troubleshooting-2/some-phrases-are-still-displayed-in-english-after-translating-them-via-the-front-end-phrases-page/#post-20510  

And as it happens, here: 

@alain,

Try to add the " I allow to create an account and send confirmation email. " phrase and translate it.

 but sometime, it just doesn't work. As here:  

No, there is not such an issue with this phrase. We've already checked it.