The triage rename form reused persons_filter_type_person ("Person") and
persons_section_details ("Angaben zur Person") as the first/last-name field
labels, so a screen reader announced the wrong name for each input. Add
dedicated persons_field_first_name / persons_field_last_name keys (de/en/es)
and use them.
Refs #667
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>