v0.3.5 — i18n cap + config-tool WiFi-wipe fixes

Fixed

• Translations past ~128 keys reverted to English. The i18n loader capped SD-loaded strings at 128, but the
  language files now hold ~197 keys — so on German/French/Italian every key past the cap silently fell back to
  English (e.g. canned_5–8, plus the offgrid / firmware-update / WiFi / USB / BLE / map / heard-adverts /
  toast screens). Raised the cap to 256 and added a boot-time warning if a language file ever exceeds it.
• Config tool wiped stored WiFi on edit. The tool's file-import never loaded the wifi section, so
  importing a device's config.json, editing it, and re-exporting produced an empty wifi block — clearing
  the device's stored SSID/password on the next copy to SD. WiFi (and the persisted BLE pairing PIN) now
  round-trip correctly, including through the share-link and start-fresh paths.