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Issue: i18n broken during SSR — wrong locale, missing translations, and stale cached messages

Issue: i18n broken during SSR — wrong locale, missing translations, and stale cached messages: a task in LegoFlow-SWE (Harbor dataset). Steps to reproduce - Configure a site with multiple locales (e.g., /en/... , /fr/... ). - Start SSR and request a page under /fr/ . - Inspect the rendered content…

The task

**Steps to reproduce** - Configure a site with multiple locales (e.g., `/en/...`, `/fr/...`). - Start SSR and request a page under `/fr/`. - Inspect the rendered content and any locale-specific logic using `injectLocale()`.

Part of Lego-X/LegoFlow-SWE.