Fix missing images on English pages

Hugo only auto-shares page-bundle resources across translations when
each language has its own content directory; with filename-based
translation (index.fr.md / index.en.md in the same folder) a resource
with no language code is assigned to the default language only. Add
.en.-suffixed copies of every image referenced from English pages and
point the English markdown at them.

content/documentation/securité/cadenas_vert/ssl.en.md

@@ -10,7 +10,7 @@ cascade:
 
 You've seen it thousands of times, haven't you? That little **green padlock** (or sometimes gray, depending on your browser and the site) that shows up next to a website's address in your navigation bar. You click on it, you look at it, you think "cool, it's secure," and you move on.
 
-![Certificat](certificat.png)
+![Certificat](certificat.en.png)
 
 But... do you really know what it means? 🤔 All the **mechanics that kick in** just so this little symbol appears? It's much more than a simple icon! It's the visible part of an iceberg. \
 **So, what's our mission today? 🚀**

content/documentation/securité/ssl_bumping/ssl_bumping.en.md

@@ -22,7 +22,7 @@ The principle of HTTPS is comparable to sending mail in a safe where only the se
 
 **SSL Bumping** gets around this problem by inserting itself in the middle of the communication:
 
-![SSL Bumping Expliqué](images/ssl_bumping_explique.fr.svg#center)
+![SSL Bumping Expliqué](images/ssl_bumping_explique.en.svg#center)
 
 The proxy will:
 1. **Intercept** the client's HTTPS connection.
@@ -57,7 +57,7 @@ For SSL Bumping to work, the proxy must be able to generate certificates on the
 
 When you try to access `https://www.example.com`:
 
-![Génération des faux certificats](images/generation_des_faux_certificats.fr.svg)
+![Génération des faux certificats](images/generation_des_faux_certificats.en.svg)
 
 1. The proxy intercepts your request.
 2. It connects to the real `example.com` server and retrieves its legitimate certificate.
@@ -77,7 +77,7 @@ To really understand the mechanism, nothing beats hands-on practice. I've prepar
 
 ### Lab Architecture
 
-![Architecture du lab SSL](images/architecture_du_lab_ssl.fr.svg)
+![Architecture du lab SSL](images/architecture_du_lab_ssl.en.svg)
 
 ### Quick Deployment