Add documentation for adding a new locale

Javier Garciarequested to merge
docs/adding-a-new-locale into main

Summary

Adds docs/adding-a-new-locale.md — a step-by-step guide covering the full process of adding a new language to the site:

  • Registering the locale in nuxt.config.ts and LANG_OPTIONS
  • Creating i18n UI strings and Marketo form translations
  • Setting up shared footer content
  • Creating translated content pages
  • Testing locally and with pnpm generate

This was motivated by the Korean locale work in !5188 (merged) — having this documented will make future locale additions faster and less error-prone.

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