[FIX] website_livechat: load im_livechat i18n

As authenticated user, join the website livechat. As a portal user,
start a livechat. Close it, it asks you to review the chat but all
messages are displayed in english.

opw-1958819

closes odoo/odoo#32629

Signed-off-by: Julien Castiaux <Julien00859@users.noreply.github.com>

addons/website_livechat/models/__init__.py

@@ -2,4 +2,5 @@
 
 from . import im_livechat
 from . import website
-from . import res_config_settings
+from . import res_config_settings
+from . import ir_http

addons/website_livechat/models/ir_http.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models
+from odoo.osv import expression
+
+
+class IrHttp(models.AbstractModel):
+    _inherit = 'ir.http'
+
+    @classmethod
+    def _get_translation_frontend_modules_domain(cls):
+        domain = super(IrHttp, cls)._get_translation_frontend_modules_domain()
+        return expression.OR([domain, [('name', '=', 'im_livechat')]])
+