Landio multi language

Hi,
I am using Landio skeleton for a multilanguage website. All is fine but the header.
Header and Footer texts are hardcoded into site.yaml

header:
title: 'Land.io, blissful innovation.'
description: 'Craft your journey, <em>absolutely free</em>, with <a href="#" class="jumbolink">Admin plugin support.</a>.'
buttons:

  text: 'Some Button'
  url: 'http://tympanus.net/codrops/?p=19439'
  icon: sketch

footer:
links:

  text: 'Terms & Conditions'
  url: '#'
-
  text: Legals
  url: '#' 

Is there a solution to provide multilanguage for those texts?

I try to understand how to translate but the doc laks some informations.

site.yaml contain:
-```
header:
title: 'Land.io, blissful innovation.'
description: 'Craft your journey, <em>absolutely free</em>, with <a href="#" class="jumbolink">Admin plugin support.</a>.'
buttons:

  text: 'Some Button'
  url: 'http://tympanus.net/codrops/?p=19439'
  icon: sketch

-```

header.html.twig contain (added the |t):
- <header class="jumbotron bg-inverse text-center center-vertically" role="banner"> <div class="container"> <h1 class="display-3">{{ site.header.title|t }}</h1> <h2 class="m-b-lg">{{ site.header.description }}</h2> {% for item in site.header.buttons %} -

Then I created a /user/languages folder (it does not exist) and put in it a fr.yaml file.

I tried without success:
- SITE_HEADER_TITLE: 'ma traduction' SITE.HEADER.TITLE: 'ma traduction' -
Help really appreciated. Thanks.

I finaly found that:

Site.yaml must be
header:
title: SITE_HEADER_TITLE

fr.yaml must be
SITE_HEADER_TITLE: 'my translated text'

and header.hml.twig
<h1 class="display-3">{{ site.header.title|t }}</h1>

I do not undestrand why this skeleton is not provided ready for translation

Note: Am I alone to find that this forum need more text contrast for better readability?