Start each market with a stable language or regional URL strategy. Confirm that every translated page resolves successfully, uses a self-referencing canonical and appears in the correct language-specific sitemap.
Hreflang must be reciprocal and point to live equivalents. Translate SEO titles and descriptions separately from body content, then validate Open Graph fields, structured data, image ALT text and breadcrumb labels.
Finish with a crawl from each locale. Look for mixed-language navigation, links that return to the source language, unavailable translations, redirected canonicals and stale slugs. Store the findings with the affected page so the team has a clear repair queue.