diff --git a/apps/participation/templates/participation/chat.html b/apps/participation/templates/participation/chat.html
index bbdd0f4..602e1f7 100644
--- a/apps/participation/templates/participation/chat.html
+++ b/apps/participation/templates/participation/chat.html
@@ -1,16 +1,39 @@
 {% extends "base.html" %}
 
-{% block extracss %}
-    <style>
-    iframe {
-        width: 100%;
-        height: 100vh;
-        margin: 0;
-        padding: 0;
-    }
-    </style>
-{% endblock %}
+{% load i18n %}
 
-{% block fullcontent %}
-    <iframe frameborder="0" src="https://element.correspondances-maths.fr/#/room/#faq:correspondances-maths.fr"></iframe>
+{% block content %}
+    <div class="alert alert-warning">
+    {% blocktrans trimmed %}
+        The chat is located on the dedicated Matrix server:
+    {% endblocktrans %}
+    </div>
+
+    <div class="alert text-center">
+    <a class="btn btn-success" href="https://element.correspondances-maths.fr/#/room/#faq:correspondances-maths.fr" target="_blank">
+        <i class="fas fa-server"></i> {% trans "Access to the Matrix server" %}
+    </a>
+    </div>
+
+    <div class="alert alert-info">
+    <p>
+    {% blocktrans trimmed %}
+        To connect to the server, you can select "Log in", then use your credentials of this platform to connect
+        with the central authentication server, then you must trust the connection between the Matrix account and the
+        platform. Finally, you will be able to access to the chat platform.
+    {% endblocktrans %}
+    </p>
+
+    <p>
+    {% blocktrans trimmed %}
+        You will be invited in some basic rooms. You must confirm the invitations to join channels.
+    {% endblocktrans %}
+    </p>
+
+    <p>
+    {% blocktrans trimmed %}
+        If you have any trouble, don't hesitate to contact us :)
+    {% endblocktrans %}
+    </p>
+    </div>
 {% endblock %}
diff --git a/locale/fr/LC_MESSAGES/django.po b/locale/fr/LC_MESSAGES/django.po
index 984e3a1..eb82b5d 100644
--- a/locale/fr/LC_MESSAGES/django.po
+++ b/locale/fr/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Corres2math\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-11-16 11:55+0100\n"
+"POT-Creation-Date: 2020-12-04 01:42+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: Yohann D'ANELLO <yohann.danello@animath.fr>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -289,6 +289,40 @@ msgstr "phase"
 msgid "phases"
 msgstr "phases"
 
+#: apps/participation/templates/participation/chat.html:7
+msgid "The chat is located on the dedicated Matrix server:"
+msgstr "Le chat est situé sur le serveur Matrix dédié aux Correspondances :"
+
+#: apps/participation/templates/participation/chat.html:14
+msgid "Access to the Matrix server"
+msgstr "Accéder au serveur Matrix"
+
+#: apps/participation/templates/participation/chat.html:20
+msgid ""
+"To connect to the server, you can select \"Log in\", then use your "
+"credentials of this platform to connect with the central authentication "
+"server, then you must trust the connection between the Matrix account and "
+"the platform. Finally, you will be able to access to the chat platform."
+msgstr ""
+"Pour se connecter au serveur, vous pouvez sélectionner \"Se connecter\", "
+"puis utiliser vos identifiants de cette plateforme via l'authentication "
+"centralisée. Vous devrez ensuite approuver la connexion entre le compte "
+"Matrix et la plateforme. Enfin, vous pourrez accéder à la plateforme de chat."
+
+#: apps/participation/templates/participation/chat.html:28
+msgid ""
+"You will be invited in some basic rooms. You must confirm the invitations to "
+"join channels."
+msgstr ""
+"Vous serez invités dans quelques salons basiques. Vous devez confirmer les "
+"invitations pour rejoindre les canaux."
+
+#: apps/participation/templates/participation/chat.html:34
+msgid "If you have any trouble, don't hesitate to contact us :)"
+msgstr ""
+"Si vous rencontrez le moindre problème, n'hésitez surtout pas à nous "
+"contacter :)"
+
 #: apps/participation/templates/participation/create_team.html:11
 #: corres2math/templates/base.html:237
 msgid "Create"
@@ -751,7 +785,11 @@ msgstr "participant"
 msgid "coach"
 msgstr "encadrant"
 
-#: apps/registration/forms.py:68
+#: apps/registration/forms.py:31
+msgid "This email address is already used."
+msgstr "Cette adresse e-mail est déjà utilisée."
+
+#: apps/registration/forms.py:77
 msgid "The uploaded file must be a PDF, PNG of JPEG file."
 msgstr "Le fichier envoyé doit être au format PDF, PNG ou JPEG."