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In each of de/en/es: - nav_stammbaum - 9 relation_<type>_of keys for the stored relation types - 17 relation_inferred_<label> keys covering everything LABEL_MAP emits (parent/child/spouse/sibling, grand*, great-grand*, uncle/aunt, niece/nephew, in-laws, cousin, distant) - doc_details_field_relationship — badge label "Verwandtschaft" - stammbaum_empty_*, stammbaum_panel_*, stammbaum_zoom_*, stammbaum_generations - relation_error_* (inline form errors), relation_year_error_*, relation_label_*, relation_btn_* - person_relationships_heading + person_relationships_empty - error_relationship_not_found / error_circular_relationship / error_duplicate_relationship for the centralised error mapper frontend/src/lib/errors.ts mirrors the backend's three new ErrorCodes and routes them through getErrorMessage(). Refs #358. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>