Issues with translations using Content blocks (Uncode Theme)

Hi,
I’m using UNCODE Theme. And Polylang plugin to translate my French website version into english.
My website is under construction so you can’t see it without login access – I can give it to you.

I’ve an issue. The theme Uncode works with Content blocks. I create a version of a content block in French and a version in English and I “plug” them together. Then I select these different content blocks in my Theme or Page Options, for Header, Content and Footer.
Then I create my page (for example) in French. And I duplicate it on an English version.
Header and Footer translate all the items of their content blocks ; but the Content block of the Content zone doesn’t work totally : it works with the dynamic elements, but not with items such as Heading where I write manually my translated title. So, in the english version of the page, I still have the French version of headings, text buttons etc.

For example :
In FRENCH version https://galerie-angalia.com/fr/portfolio/jp-mika-oeuvres/ah-ekolo-ya-sika-po-na-ngai-2017/
In ENGLISH version https://galerie-angalia.com/en/portfolio/jp-mika-works/ah-ekolo-ya-sika-po-na-ngai-2017/

-> The elements “en fran?ais” and “demande d’informations” are not translated (although they are translated on the english content block : “in english” and “Require”)

Why doest it work with header and footer and not with the content ?

Many thanks

The page I need help with: [log in to see the link]