diff --git a/addons/mail/static/src/js/core/translation.js b/addons/mail/static/src/js/core/translation.js
new file mode 100644
index 00000000000..a8db8cebc57
--- /dev/null
+++ b/addons/mail/static/src/js/core/translation.js
@@ -0,0 +1,27 @@
+odoo.define('mail/static/src/js/core/translation.js', function (require) {
+'use strict';
+
+const { TranslationDataBase } = require('web.translation');
+
+const { Component } = owl;
+
+TranslationDataBase.include({
+    /**
+     * @override
+     */
+    set_bundle() {
+        const res = this._super(...arguments);
+        if (Component.env.messaging) {
+            // Update messaging locale whenever the translation bundle changes.
+            // In particular if messaging is created before the end of the
+            // `load_translations` RPC, the default text direction has to be
+            // updated by the received one.
+            Component.env.messaging.locale.update({
+                textDirection: this.parameters.direction,
+            });
+        }
+        return res;
+    },
+});
+
+});
diff --git a/addons/mail/views/assets.xml b/addons/mail/views/assets.xml
index 7a6447651be..4b1877277e0 100644
--- a/addons/mail/views/assets.xml
+++ b/addons/mail/views/assets.xml
@@ -9,6 +9,8 @@
 
         <template id="assets_backend" name="mail assets" inherit_id="web.assets_backend">
             <xpath expr="." position="inside">
+                <script type="text/javascript" src="/mail/static/src/js/core/translation.js"></script>
+
                 <script type="text/javascript" src="/mail/static/src/js/many2many_tags_email.js"></script>
                 <script type="text/javascript" src="/mail/static/src/js/many2one_avatar_user.js"></script>
                 <script type="text/javascript" src="/mail/static/src/js/field_char.js"></script>