Translation problem on one page

Hi,

I have installed PB last version on my WP 4.9.8, with Polylang as Language switcher. I switch between English (EN) and French (FR).

All works OK on login/logout pages, but not on register page ([wppb-register]), which remains in EN. On this page, labels are still in EN, but errors messages, and reCAPTCHA (v2) switch correctly.
Fields (First Name => Prénom; Last Name => Nom, …) are not translated. But I saw them in the profile builder translation file.

What’s wrong ?

BR

Sylvain