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diff --git a/addons/website/models/res_lang.py b/addons/website/models/res_lang.py
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+++ b/addons/website/models/res_lang.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, models, tools, _
+from odoo.addons.website.models import ir_http
+from odoo.exceptions import UserError
+from odoo.http import request
+
+
+class Lang(models.Model):
+    _inherit = "res.lang"
+
+    def write(self, vals):
+        if 'active' in vals and not vals['active']:
+            if self.env['website'].search([('language_ids', 'in', self._ids)]):
+                raise UserError(_("Cannot deactivate a language that is currently used on a website."))
+        return super(Lang, self).write(vals)
+
+    @api.model
+    @tools.ormcache_context(keys=("website_id",))
+    def get_available(self):
+        website = ir_http.get_request_website()
+        if not website:
+            return super().get_available()
+        # Return the website-available ones in this case
+        return request.website.language_ids.get_sorted()