Taxonomy term names are content, not interface strings, so .po files
don't translate them. This adds programmatic content translations via
the ContentLanguageSettings API and addTranslation/setName on each term.
- Add _structural_pages_term_translations() with pt-br name map
- Add _structural_pages_add_term_translations() to create/update translations
- Add _structural_pages_ensure_content_translation() using ContentLanguageSettings API
- Add config/optional for new installs with content_translation enabled
- Remove term name entries from .po file (ineffective for content)
- Add update hook 10004 to fix existing installations
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Renames the module from site_structure to structural_pages and pluralizes
the taxonomy vocabulary machine name from site_section to site_sections,
updating all config, PHP, translations, and documentation references
while preserving field_site_section, clears_site_section, and $site_section_id.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
