Fix: restore real translations and add updatedCustomUnitRateName key surgically

The previous commit regenerated all language files via generateTranslations,
replacing real translations with placeholder stubs (e.g. "[es] archived"
instead of "archivado"). This restores the original translations from main
and adds only the new updatedCustomUnitRateName key to each file.

Co-authored-by: Sahil <thesahindia@users.noreply.github.com>

Author: MelvinBot