EDD/ Polylang: Cannot translate completly checkout page

Wordpress: 4.9.1

Easy Digital Download: 2.8.14
Polylang: 2.2.7
Easy Digital Download Polylang: 0.0.1
Jetpack: 5.5.1
twenty-fifteen child

Hello,

You might help for a translation (FR / EN) problem on the checkout page of Easy Digital Download (thru Polylang).

When I set the WP site language to FR (admin): everything goes ok for the french – on the site – but a few part of the englishbcheckout page is not correctly translated.

If i do the opposite (setting in admin to EN), EN checkout page is ok, but the french one not completly translated, for the the same text.

___

So, if site language in english (WP admin) and the user choose french, the french checkout page (Panier) is not completely translated:

1)
??
Personal Info
Email Address *
We will send the purchase receipt to this address.
First Name *
We will use this to personalise your account experience.
Last Name
We will use this as well to personalise your account experience.
??
instead of the same but in french
2)
and label ??Show conditions and Terms?? instead of french ??Afficher les conditions??
3)
and bottom button label set to PURCHASE (instead of french ACHETER)
___

if site language in french (admin) and the user choose english, checkout page ok except:

1)
??
Informations personnelles
Adresse e-mail *
Le re?u d’achat sera envoyé à cette adresse.
Prénom *
Nous l’utiliserons pour personnaliser votre compte.
Nom
Nous l’utiliserons aussi pour personnaliser votre compte.
??
instead of the same but in english…
2)
and label ??Afficher les conditions?? instead if Show conditions and Terms
3)
and bottom button label set to acheter (instead of english PURCHASE)

___

I hope it is clear enough, quite new to wp but learning… but I have tried lot of things and I don’t really see why this is happening… thanks for the help.