[FIX] website: repair "overwrite" mode for translation wizard

In the context of bug #43365, the fix merged in #48031 introduced an
override of `ir.translation._load_module_terms()`, which calls `super()`
then does some extra stuff.

This was forward-ported to later versions, unfortunately the
forward-ports missed the fact that the method signature changed at some
point (circa saas-13.2) and the `overwrite` flag which used to be passed
in the `context` had become an explicit method argument.

As a result, that argument is lost in the `super()` call and the
`website` module entirely disables the "overwrite" mode for the
translation loading wizard.

The fwd-port that seems to introduce the issue is odoo/odoo#50477 (998987f8ee148235f4025eb97a424e838ac6fc9f)

closes odoo/odoo#64251

X-original-commit: 26355a6bf83a194c2e398e859e49920da1f415b8
Signed-off-by: Olivier Dony (odo) <odo@openerp.com>

addons/website/models/ir_translation.py

@@ -8,7 +8,7 @@ class IrTranslation(models.Model):
 
     def _load_module_terms(self, modules, langs, overwrite=False):
         """ Add missing website specific translation """
-        res = super()._load_module_terms(modules, langs)
+        res = super()._load_module_terms(modules, langs, overwrite=overwrite)
 
         if not langs or not modules:
             return res