gen-lang-builtin.py generates src/ui-touch/i18n_builtin.h from the SAME
deploy/apps/lang/*.lang files the Store serves, so the downloaded and the
compiled-in translations can never drift — translators still edit one place.
TR() consults the loaded file overlay first, then the baked table, then
English, so a downloaded language still wins on boards that can fetch one.
CAP_BUILTIN_LANGS is ON for the V4 (its net worker is fragile at ~95%
internal RAM, so the Store is not dependable there and it would otherwise be
stuck on English) and OFF elsewhere. Cost is FLASH only, no RAM:
V4 71.7% -> 85.5%
T-Deck 75.5% (unchanged, gate off)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
