I've fixed and updated Spanish translations in theme-common.json at packages/docusaurus-theme-translations/locales/es/. P

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved my working plan.