SEO - Internal link errors

[mnelsonBT]

Addressing internal link errors from SEO audit, replacing broken/incorrect links with the correct version.

Description

• Fixed 11 broken internal links identified in the SEO audit across translated content files
  -- Deleted the expired /10years/terms-and-conditions link (app/[locale]/10years/page.tsx) (claims are no longer live) and removed related un-used import per lint
  -- Removed /zh/whitepaper/ on the language-resources page (locale-prefix bug was causing /es/zh/whitepaper/ etc. on translated pages) and user can view any page on site now under Chinese translation
  -- Fixed 5 Italian translation files: missing leading slashes, erroneous /en locale prefix, wrong tutorial slug, and a pluralization typo (/validiums/ → /validium/)
  -- Fixed Chinese dencun: glossory typo → glossary
  -- Fixed Polish merge: translated slug warstwa-2 → layer-2
  -- Fixed Portuguese beacon-chain: translated slug participantes → staking
  -- Fixed Spanish data-storage: missing leading slash and erroneous es/ locale prefix

Out of scope - Melissa to follow up with dev team:

• Broken URL that originates from app database via fetchApps.ts
• Subdomains
• Contributor avatar images - team decision on how to handle required (remove vs. replace with template)

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Lighthouse	7 paths audited Performance: 60 (no change from production) Accessibility: 94 (🟢 up 1 from production) Best Practices: 100 (no change from production) SEO: 99 (no change from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

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[wackerow]

lgtm, thanks @mnelsonBT