Thai translation models for dragomand

Mozilla's Firefox Translations models, from the Remote Settings
collection translations-models-v2, licensed under MPL-2.0 (see
LICENSE; the mozilla/translations README states that the model
files are distributed under the MPL 2.0 license).

Pairs and versions:
  en-th/3.0
  th-en/3.0

Each manifest.json lists the sha256 of every file; the daemon
verifies them. Project: https://dragomand.l10n-bg.dev
