The language set endpoint was being called at /api/v1/language/set but
the route is actually registered under the platform prefix at
/api/v1/platform/language/set.
Updated all frontend code calling this endpoint:
- app/templates/platform/base.html
- app/templates/vendor/partials/header.html
- app/modules/core/static/storefront/js/storefront-layout.js
- app/modules/core/static/vendor/js/init-alpine.js
- app/modules/core/static/admin/js/init-alpine.js
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>