The translation build's CPU-heavy work (deep clone of the 100k+ entry
master, the two full scans and JSON.stringify per language) now runs in a
worker thread, so "Alles vertalen" no longer blocks the main event loop.
Network/DB parts (official Habbo fetch, LibreTranslate, file writes) stay
on the main thread. The pure helpers were extracted to furni-data-i18n-core
(no server-only deps) so the worker can import them. Falls back to the same
helpers on the main thread when no worker is available or in tests.
openhands
f94246e067