You can do this by adding javascript by adding a <code> block where you want to add a multilangual change.
<!-- your HTML image -->
<img id="taal-img" src="https://your.website.url/image.png" alt="alt text" style="width:100%;" loading="lazy">
<script>
(function() {
const path = window.location.pathname;
const img = document.getElementById("taal-img");
if (!img) return; // If image does not exist, stop
//
if (path.startsWith("/en/")) {
img.src = "https://your.website.url/image_en.png";
} else if (path.startsWith("/fr_FR/")) {
img.src = "https://your.website.url/image_fr.png";
} else {
img.src = "https://your.website.url/image.png";
}
})();
</script>
path.startsWith is the place where you set your language.
You can see this value when you go to your website and change to another language.
If there is no value the standard image will be shown (standard language of website)
Hope this helps
Thanks Ermin Trevisan! One question: Will this module work with odoo V. 8.1?
There is no such thing as Odoo 8.1. It is working for your Odoo version.