[FIX] website_gengo: adapt source->src in 13.0

In 13.0 66ef641f33 the source field was removed.

This would cause an error when gengo is updating a existing
ir.translation record (eg. if we do two times gengo auto-translations).

opw-2234713
closes #49884

closes odoo/odoo#50001

X-original-commit: 527b3bfb2b17a821d6051a9010ec717a62c7c748
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/website_gengo/controllers/main.py

@@ -57,7 +57,7 @@ class WebsiteGengo(http.Controller):
                 vals.update({
                     'name': 'website',
                     'lang': lang,
-                    'source': initial_content,
+                    'src': initial_content,
                 })
                 IrTranslation.create(vals)
         return True